MTConnectStreams_1.7.xsd

<?xml version='1.0' encoding='UTF-8'?>
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<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns='urn:mtconnect.org:MTConnectStreams:1.7' xmlns:mt='urn:mtconnect.org:MTConnectStreams:1.7' targetNamespace='urn:mtconnect.org:MTConnectStreams:1.7' elementFormDefault='qualified' attributeFormDefault='unqualified' xmlns:vc='http://www.w3.org/2007/XMLSchema-versioning' vc:minVersion='1.1'>
  <xs:element name='MTConnectStreams' type='MTConnectStreamsType'>
    <xs:annotation>
      <xs:documentation>
        The root node for MTConnect
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='SenderType'>
    <xs:annotation>
      <xs:documentation>
        The sender of the message
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='CreationTimeType'>
    <xs:annotation>
      <xs:documentation>
        The date and time the document was created
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:dateTime'/>
  </xs:simpleType>
  <xs:simpleType name='SequenceType'>
    <xs:annotation>
      <xs:documentation>
        A sequence number
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='1'/>
      <xs:maxExclusive value='18446744073709551615'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='TestIndicatorType'>
    <xs:annotation>
      <xs:documentation>
        A debugging flag for testing.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:boolean'/>
  </xs:simpleType>
  <xs:simpleType name='InstanceIdType'>
    <xs:annotation>
      <xs:documentation>
        The instance number of the agent, used for fault tolerance
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='1'/>
      <xs:maxExclusive value='18446744073709551615'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='BufferSizeType'>
    <xs:annotation>
      <xs:documentation>
        The size of the agents buffer
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='1'/>
      <xs:maxExclusive value='4294967295'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='TimestampType'>
    <xs:annotation>
      <xs:documentation>
        The time the sample was reported
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:dateTime'/>
  </xs:simpleType>
  <xs:simpleType name='OccurrenceTimeType'>
    <xs:annotation>
      <xs:documentation>
        The time a sample occurred
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:dateTime'/>
  </xs:simpleType>
  <xs:simpleType name='VersionType'>
    <xs:annotation>
      <xs:documentation>
        A version number
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:NMTOKEN'/>
  </xs:simpleType>
  <xs:simpleType name='NameType'>
    <xs:annotation>
      <xs:documentation>
        A short name for any element
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='UuidType'>
    <xs:annotation>
      <xs:documentation>
        A universally unique id that uniquely identifies the element for
        it&apos;s entire life
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='SerialNumberAttrType'>
    <xs:annotation>
      <xs:documentation>
        A serial number for a piece of equipment
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='ItemSourceType'>
    <xs:annotation>
      <xs:documentation>
        The measurement source
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='RateType'>
    <xs:annotation>
      <xs:documentation>
        A sample rate in milliseconds per sample
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='ComponentIdType'>
    <xs:annotation>
      <xs:documentation>
        The id of the component (maps to the id from probe)
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:ID'/>
  </xs:simpleType>
  <xs:simpleType name='IDType'>
    <xs:annotation>
      <xs:documentation>
        An identifier
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:ID'/>
  </xs:simpleType>
  <xs:simpleType name='SignificantDigitsValueType'>
    <xs:annotation>
      <xs:documentation>
        The number significant digits
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'/>
  </xs:simpleType>
  <xs:simpleType name='CompositionIdType'>
    <xs:annotation>
      <xs:documentation>
        The item&apos;s reference to the Device model composition
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='DurationTimeType'>
    <xs:annotation>
      <xs:documentation>
        A length of time in seconds
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='RemovedType'>
    <xs:annotation>
      <xs:documentation>
        A flag indicating the item has been removed
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:boolean'/>
  </xs:simpleType>
  <xs:simpleType name='KeyType'>
    <xs:annotation>
      <xs:documentation>
        The key for adata set
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:NMTOKEN'/>
  </xs:simpleType>
  <xs:simpleType name='DeviceModelChangeTimeType'>
    <xs:annotation>
      <xs:documentation>
        A timestamp in 8601 format of the last update of the Device information
        for any device
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:dateTime'/>
  </xs:simpleType>
  <xs:simpleType name='AssetIdType'>
    <xs:annotation>
      <xs:documentation>
        The unique id of the asset
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='AssetAttrTypeType'>
    <xs:annotation>
      <xs:documentation>
        An asset type
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='AssetBufferSizeType'>
    <xs:annotation>
      <xs:documentation>
        The maximum number of assets
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='1'/>
      <xs:maxExclusive value='4294967295'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='AssetCountAttrType'>
    <xs:annotation>
      <xs:documentation>
        The number of assets
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'>
      <xs:minInclusive value='0'/>
      <xs:maxExclusive value='4294967295'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='FloatListValueType'>
    <xs:annotation>
      <xs:documentation>
        Common floating point sample value
      </xs:documentation>
    </xs:annotation>
    <xs:list>
      <xs:simpleType>
        <xs:restriction base='xs:float'/>
      </xs:simpleType>
    </xs:list>
  </xs:simpleType>
  <xs:simpleType name='ThreeSpaceValueType'>
    <xs:annotation>
      <xs:documentation>
        A three dimensional value &apos;X Y Z&apos; or &apos;A B C&apos;
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='FloatListValueType'>
      <xs:maxLength value='3'/>
      <xs:minLength value='3'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DescriptionTextType'>
    <xs:annotation>
      <xs:documentation>
        A description
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemEnumExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The types of measurements available
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemEnumEnum'>
    <xs:annotation>
      <xs:documentation>
        The types of measurements available
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACCELERATION'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the rate of change of velocity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACCUMULATED_TIME'>
        <xs:annotation>
          <xs:documentation>
            The measurement of accumulated time for an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AMPERAGE'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.6*. Replaced by `AMPERAGE_AC` and
            `AMPERAGE_DC`. The measurement of electrical current.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ANGLE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of angular position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ANGULAR_ACCELERATION'>
        <xs:annotation>
          <xs:documentation>
            The measurement rate of change of angular velocity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ANGULAR_VELOCITY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the rate of change of angular position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AXIS_FEEDRATE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the feedrate of a linear axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CAPACITY_FLUID'>
        <xs:annotation>
          <xs:documentation>
            The fluid capacity of an object or container.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CAPACITY_SPATIAL'>
        <xs:annotation>
          <xs:documentation>
            The geometric capacity of an object or container.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLOCK_TIME'>
        <xs:annotation>
          <xs:documentation>
            The value provided by a timing device at a specific point in time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONCENTRATION'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the percentage of one component within a mixture
            of components
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONDUCTIVITY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the ability of a material to conduct electricity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUTTING_SPEED'>
        <xs:annotation>
          <xs:documentation>
            The speed difference (relative velocity) between the cutting
            mechanism and the surface of the workpiece it is operating on.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DENSITY'>
        <xs:annotation>
          <xs:documentation>
            The volumetric mass of a material per unit volume of that material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEPOSITION_ACCELERATION_VOLUMETRIC'>
        <xs:annotation>
          <xs:documentation>
            The rate of change in spatial volume of material deposited in an
            additive manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEPOSITION_DENSITY'>
        <xs:annotation>
          <xs:documentation>
            The density of the material deposited in an additive manufacturing
            process per unit of volume.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEPOSITION_MASS'>
        <xs:annotation>
          <xs:documentation>
            The mass of the material deposited in an additive manufacturing
            process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEPOSITION_RATE_VOLUMETRIC'>
        <xs:annotation>
          <xs:documentation>
            The rate at which a spatial volume of material is deposited in an
            additive manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEPOSITION_VOLUME'>
        <xs:annotation>
          <xs:documentation>
            The spatial volume of material to be deposited in an additive
            manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DISPLACEMENT'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the change in position of an object.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ELECTRICAL_ENERGY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of electrical energy consumption by a component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EQUIPMENT_TIMER'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the amount of time a piece of equipment or a
            sub-part of a piece of equipment has performed specific activities.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FILL_LEVEL'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the amount of a substance remaining compared to
            the planned maximum amount of that substance.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FLOW'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the rate of flow of a fluid.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FREQUENCY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the number of occurrences of a repeating event
            per unit time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GLOBAL_POSITION'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in Version 1.1
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LENGTH'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the length of an object.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LEVEL'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.2*. See `FILL_LEVEL`. Represents the
            level of a resource.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINEAR_FORCE'>
        <xs:annotation>
          <xs:documentation>
            A {{term(Force)}} applied to a mass in one direction only.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LOAD'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the actual versus the standard rating of a piece
            of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MASS'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the mass of an object(s) or an amount of
            material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PATH_FEEDRATE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the feedrate for the axes, or a single axis,
            associated with a {{block(Path)}} component-a vector.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PATH_FEEDRATE_PER_REVOLUTION'>
        <xs:annotation>
          <xs:documentation>
            The feedrate for the axes, or a single axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PATH_POSITION'>
        <xs:annotation>
          <xs:documentation>
            A measured or calculated position of a control point associated with
            a {{block(Controller)}} element, or {{block(Path)}} element if
            provided, of a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PH'>
        <xs:annotation>
          <xs:documentation>
            A measure of the acidity or alkalinity of a solution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POSITION'>
        <xs:annotation>
          <xs:documentation>
            A measured or calculated position of a {{block(Component)}} element
            as reported by a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWER_FACTOR'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the ratio of real power flowing to a load to the
            apparent power in that AC circuit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRESSURE'>
        <xs:annotation>
          <xs:documentation>
            The force per unit area measured relative to atmospheric pressure.
            Commonly referred to as gauge pressure.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_TIMER'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the amount of time a piece of equipment has
            performed different types of activities associated with the process
            being performed at that piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RESISTANCE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the degree to which a substance opposes the
            passage of an electric current.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTARY_VELOCITY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the rotational speed of a rotary axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SOUND_LEVEL'>
        <xs:annotation>
          <xs:documentation>
            The measurement of a sound level or sound pressure level relative to
            atmospheric pressure.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SPINDLE_SPEED'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.2*. Replaced by `ROTARY_VELOCITY`. The
            rotational speed of the rotary axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STRAIN'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the amount of deformation per unit length of an
            object when a load is applied.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TEMPERATURE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of temperature.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TENSION'>
        <xs:annotation>
          <xs:documentation>
            The measurement of a force that stretches or elongates an object.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TILT'>
        <xs:annotation>
          <xs:documentation>
            The measurement of angular displacement.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TORQUE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the turning force exerted on an object or by an
            object.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VELOCITY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the rate of change of position of a
            {{block(Component)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VISCOSITY'>
        <xs:annotation>
          <xs:documentation>
            The measurement of a fluids resistance to flow.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLTAGE'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.6*. Replaced by `VOLTAGE_AC` and
            `VOLTAGE_DC`. The measurement of electrical potential between two
            points.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the apparent power in an electrical circuit,
            equal to the product of root-mean-square (RMS) voltage and RMS
            current (commonly referred to as VA).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE_REACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of reactive power in an AC electrical circuit
            (commonly referred to as VAR).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLUME_FLUID'>
        <xs:annotation>
          <xs:documentation>
            The fluid volume of an object or container.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLUME_SPATIAL'>
        <xs:annotation>
          <xs:documentation>
            The geometric volume of an object or container.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATTAGE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of power flowing through or dissipated by an
            electrical circuit or piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AMPERAGE_AC'>
        <xs:annotation>
          <xs:documentation>
            The measurement of an electrical current that reverses direction at
            regular short intervals.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AMPERAGE_DC'>
        <xs:annotation>
          <xs:documentation>
            The measurement of an electric current flowing in one direction
            only.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLTAGE_AC'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the electrical potential between two points in an
            electrical circuit in which the current periodically reverses
            direction.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLTAGE_DC'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the electrical potential between two points in an
            electrical circuit in which the current is unidirectional.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='X_DIMENSION'>
        <xs:annotation>
          <xs:documentation>
            Measured dimension of an entity relative to the X direction of the
            referenced coordinate system. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='Y_DIMENSION'>
        <xs:annotation>
          <xs:documentation>
            Measured dimension of an entity relative to the Y direction of the
            referenced coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='Z_DIMENSION'>
        <xs:annotation>
          <xs:documentation>
            Measured dimension of an entity relative to the Z direction of the
            referenced coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DIAMETER'>
        <xs:annotation>
          <xs:documentation>
            The measured dimension of a diameter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ORIENTATION'>
        <xs:annotation>
          <xs:documentation>
            A measured or calculated orientation of a plane or vector relative
            to a cartesian coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HUMIDITY_RELATIVE'>
        <xs:annotation>
          <xs:documentation>
            The amount of water vapor present expressed as a percent to reach
            saturation at the same temperature.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HUMIDITY_ABSOLUTE'>
        <xs:annotation>
          <xs:documentation>
            The amount of water vapor expressed in grams per cubic meter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HUMIDITY_SPECIFIC'>
        <xs:annotation>
          <xs:documentation>
            The ratio of the water vapor present over the total weight of the
            water vapor and air present expressed as a percent.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OBSERVATION_UPDATE_RATE'>
        <xs:annotation>
          <xs:documentation>
            The average rate of change of values for data items in the MTConnect
            streams. The average is computed over a rolling window defined by
            the implementation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ASSET_UPDATE_RATE'>
        <xs:annotation>
          <xs:documentation>
            The average rate of change of values for assets in the MTConnect
            streams. The average is computed over a rolling window defined by
            the implementation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRESSURIZATION_RATE'>
        <xs:annotation>
          <xs:documentation>
            The change of pressure per unit time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DECELERATION'>
        <xs:annotation>
          <xs:documentation>
            Negative rate of change of velocity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ANGULAR_DECELERATION'>
        <xs:annotation>
          <xs:documentation>
            Negative rate of change of angular velocity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRESSURE_ABSOLUTE'>
        <xs:annotation>
          <xs:documentation>
            The force per unit area measured relative to a vacuum.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTIVE_AXES'>
        <xs:annotation>
          <xs:documentation>
            The set of axes currently associated with a {{block(Path)}} or
            {{block(Controller)}} {{term(Structural Element)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTUATOR_STATE'>
        <xs:annotation>
          <xs:documentation>
            Represents the operational state of an apparatus for moving or
            controlling a mechanism or system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ALARM'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED:** Replaced with {{block(CONDITION)}} category data
            items in Version 1.1.0.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ASSET_CHANGED'>
        <xs:annotation>
          <xs:documentation>
            The {{block(assetId)}} of the asset that has been added or changed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ASSET_REMOVED'>
        <xs:annotation>
          <xs:documentation>
            The {{block(assetId)}} of the asset that has been removed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AVAILABILITY'>
        <xs:annotation>
          <xs:documentation>
            Represents the {{term(Agent)}}&apos;s ability to communicate with
            the data source.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AXIS_COUPLING'>
        <xs:annotation>
          <xs:documentation>
            Describes the way the axes will be associated to each other. This is
            used in conjunction with {{block(COUPLED_AXES)}} to indicate the way
            they are interacting.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AXIS_FEEDRATE_OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            The value of a signal or calculation issued to adjust the feedrate
            of an individual linear type axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AXIS_INTERLOCK'>
        <xs:annotation>
          <xs:documentation>
            An indicator of the state of the axis lockout function when power
            has been removed and the axis is allowed to move freely.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AXIS_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indicator of the controlled state of a {{block(Linear)}} or
            {{block(Rotary)}} component representing an axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BLOCK'>
        <xs:annotation>
          <xs:documentation>
            The line of code or command being executed by a
            {{block(Controller)}} {{term(Structural Element)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BLOCK_COUNT'>
        <xs:annotation>
          <xs:documentation>
            The total count of the number of blocks of program code that have
            been executed since execution started.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHUCK_INTERLOCK'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operational condition of the interlock function
            for an electronically controller chuck.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHUCK_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operating state of a mechanism that holds a
            part or stock material during a manufacturing process. It may also
            represent a mechanism that holds any other mechanism in place within
            a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLOSE_CHUCK'>
        <xs:annotation>
          <xs:documentation>
            Service to close a chuck.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLOSE_DOOR'>
        <xs:annotation>
          <xs:documentation>
            Service to close a door.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CODE'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.1*. The programmatic code being
            executed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMPOSITION_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operating condition of a mechanism represented
            by a {{block(Composition)}} type element.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTROLLER_MODE'>
        <xs:annotation>
          <xs:documentation>
            The current operating mode of the {{block(Controller)}} component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTROLLER_MODE_OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection that changes the behavior of a piece
            of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COUPLED_AXES'>
        <xs:annotation>
          <xs:documentation>
            Refers to the set of associated axes.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DATE_CODE'>
        <xs:annotation>
          <xs:documentation>
            The time and date code associated with a material or other physical
            item.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEVICE_UUID'>
        <xs:annotation>
          <xs:documentation>
            The identifier of another piece of equipment that is temporarily
            associated with a component of this piece of equipment to perform a
            particular function.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DIRECTION'>
        <xs:annotation>
          <xs:documentation>
            An indication of a fault associated with the direction of motion of
            a {{term(Structural Element)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DOOR_STATE'>
        <xs:annotation>
          <xs:documentation>
            The operational state of a {{block(Door)}} component or composition
            element.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EMERGENCY_STOP'>
        <xs:annotation>
          <xs:documentation>
            The current state of the emergency stop signal for a piece of
            equipment, controller path, or any other component or subsystem of a
            piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='END_OF_BAR'>
        <xs:annotation>
          <xs:documentation>
            An indication that the end of a piece of bar stock has been reached.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EQUIPMENT_MODE'>
        <xs:annotation>
          <xs:documentation>
            An indication that a piece of equipment, or a sub-part of a piece of
            equipment, is performing specific types of activities.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EXECUTION'>
        <xs:annotation>
          <xs:documentation>
            The execution status of the {{block(Component)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FUNCTIONAL_MODE'>
        <xs:annotation>
          <xs:documentation>
            The current intended production status of the device or component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HARDNESS'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the hardness of a material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INTERFACE_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operation condition of an {{block(Interface)}}
            component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINE'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.4.0*. The current line of code being
            executed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINE_LABEL'>
        <xs:annotation>
          <xs:documentation>
            An optional identifier for a {{block(Block)}} of code in a
            {{block(Program)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINE_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            A reference to the position of a block of program code within a
            control program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL'>
        <xs:annotation>
          <xs:documentation>
            The identifier of a material used or consumed in the manufacturing
            process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_CHANGE'>
        <xs:annotation>
          <xs:documentation>
            Service to change the type of material or product being loaded or
            fed to a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_FEED'>
        <xs:annotation>
          <xs:documentation>
            Service to advance material or feed product to a piece of equipment
            from a continuous or bulk source.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_LAYER'>
        <xs:annotation>
          <xs:documentation>
            Identifies the layers of material applied to a part or product as
            part of an additive manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_LOAD'>
        <xs:annotation>
          <xs:documentation>
            Service to load a piece of material or product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_RETRACT'>
        <xs:annotation>
          <xs:documentation>
            Service to remove or retract material or product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_UNLOAD'>
        <xs:annotation>
          <xs:documentation>
            Service to unload a piece of material or product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MESSAGE'>
        <xs:annotation>
          <xs:documentation>
            Any text string of information to be transferred from a piece of
            equipment to a client software application.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPEN_CHUCK'>
        <xs:annotation>
          <xs:documentation>
            Service to open a chuck.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPEN_DOOR'>
        <xs:annotation>
          <xs:documentation>
            Service to open a door.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPERATOR_ID'>
        <xs:annotation>
          <xs:documentation>
            The identifier of the person currently responsible for operating the
            piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PALLET_ID'>
        <xs:annotation>
          <xs:documentation>
            The identifier for a pallet.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_CHANGE'>
        <xs:annotation>
          <xs:documentation>
            Service to change the part or product associated with a piece of
            equipment to a different part or product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_COUNT'>
        <xs:annotation>
          <xs:documentation>
            The aggregate count of parts.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_DETECT'>
        <xs:annotation>
          <xs:documentation>
            An indication designating whether a part or work piece has been
            detected or is present.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_ID'>
        <xs:annotation>
          <xs:documentation>
            An identifier of a part in a manufacturing operation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.7*. `PART_NUMBER` is now a `subType` of
            `PART_KIND_ID`. An identifier of a part or product moving through
            the manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PATH_FEEDRATE_OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            The value of a signal or calculation issued to adjust the feedrate
            for the axes associated with a {{block(Path)}} component that may
            represent a single axis or the coordinated movement of multiple
            axes.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PATH_MODE'>
        <xs:annotation>
          <xs:documentation>
            Describes the operational relationship between a {{block(Path)}}
            {{term(Structural Element)}} and another {{block(Path)}}
            {{term(Structural Element)}} for pieces of equipment comprised of
            multiple logical groupings of controlled axes or other logical
            operations.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWER_STATE'>
        <xs:annotation>
          <xs:documentation>
            The indication of the status of the source of energy for a
            {{term(Structural Element)}} to allow it to perform its intended
            function or the state of an enabling signal providing permission for
            the {{term(Structural Element)}} to perform its functions.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWER_STATUS'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.1.0*. The `ON` or `OFF` status of the
            component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_TIME'>
        <xs:annotation>
          <xs:documentation>
            The time and date associated with an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM'>
        <xs:annotation>
          <xs:documentation>
            The name of the logic or motion program being executed by the
            {{block(Controller)}} component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_COMMENT'>
        <xs:annotation>
          <xs:documentation>
            A comment or non-executable statement in the control program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_EDIT'>
        <xs:annotation>
          <xs:documentation>
            An indication of the status of the {{block(Controller)}} components
            program editing mode. A program may be edited while another is
            executed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_EDIT_NAME'>
        <xs:annotation>
          <xs:documentation>
            The name of the program being edited. This is used in conjunction
            with {{block(ProgramEdit)}} when in `ACTIVE` state. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_HEADER'>
        <xs:annotation>
          <xs:documentation>
            The non-executable header section of the control program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_LOCATION'>
        <xs:annotation>
          <xs:documentation>
            The Uniform Resource Identifier (URI) for the source file associated
            with {{block(Program)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_LOCATION_TYPE'>
        <xs:annotation>
          <xs:documentation>
            Defines whether the logic or motion program defined by
            {{block(Program)}} is being executed from the local memory of the
            controller or from an outside source.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_NEST_LEVEL'>
        <xs:annotation>
          <xs:documentation>
            An indication of the nesting level within a control program that is
            associated with the code or instructions that is currently being
            executed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTARY_MODE'>
        <xs:annotation>
          <xs:documentation>
            The current operating mode for a {{block(Rotary)}} type axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTARY_VELOCITY_OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            The percentage change to the velocity of the programmed velocity for
            a {{block(Rotary)}} type axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SERIAL_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            The serial number associated with a {{block(Component)}},
            {{block(Asset)}}, or {{block(Device)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SPINDLE_INTERLOCK'>
        <xs:annotation>
          <xs:documentation>
            An indication of the status of the spindle for a piece of equipment
            when power has been removed and it is free to rotate.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_ASSET_ID'>
        <xs:annotation>
          <xs:documentation>
            The identifier of an individual tool asset.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_GROUP'>
        <xs:annotation>
          <xs:documentation>
            An identifier for the tool group associated with a specific tool.
            Commonly used to designate spare tools.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_ID'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.2.0*. See `TOOL_ASSET_ID`. The
            identifier of the tool currently in use for a given `Path`.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            The identifier assigned by the {{block(Controller)}} component to a
            cutting tool when in use by a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_OFFSET'>
        <xs:annotation>
          <xs:documentation>
            A reference to the tool offset variables applied to the active
            cutting tool associated with a {{block(Path)}} in a
            {{block(Controller)}} type component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='USER'>
        <xs:annotation>
          <xs:documentation>
            The identifier of the person currently responsible for operating the
            piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VARIABLE'>
        <xs:annotation>
          <xs:documentation>
            A data value whose meaning may change over time due to changes in
            the opertion of a piece of equipment or the process being executed
            on that piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WAIT_STATE'>
        <xs:annotation>
          <xs:documentation>
            An indication of the reason that {{block(Execution)}} is reporting a
            value of `WAIT`.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WIRE'>
        <xs:annotation>
          <xs:documentation>
            A string like piece or filament of relatively rigid or flexible
            material provided in a variety of diameters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WORKHOLDING_ID'>
        <xs:annotation>
          <xs:documentation>
            The identifier for the current workholding or part clamp in use by a
            piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WORK_OFFSET'>
        <xs:annotation>
          <xs:documentation>
            A reference to the offset variables for a work piece or part
            associated with a {{block(Path)}} in a {{block(Controller)}} type
            component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPERATING_SYSTEM'>
        <xs:annotation>
          <xs:documentation>
            The Operating System of a component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FIRMWARE'>
        <xs:annotation>
          <xs:documentation>
            The embedded software of a component. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='APPLICATION'>
        <xs:annotation>
          <xs:documentation>
            The application on a component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LIBRARY'>
        <xs:annotation>
          <xs:documentation>
            The software library on a component
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HARDWARE'>
        <xs:annotation>
          <xs:documentation>
            An indication of a fault associated with the hardware subsystem of
            the {{term(Structural Element)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NETWORK'>
        <xs:annotation>
          <xs:documentation>
            Network details of a component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTATION'>
        <xs:annotation>
          <xs:documentation>
            A three space angular rotation relative to a coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TRANSLATION'>
        <xs:annotation>
          <xs:documentation>
            A three space linear translation relative to a coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEVICE_ADDED'>
        <xs:annotation>
          <xs:documentation>
            An {{block(Event)}} that provides the {{term(UUID)}} of new device
            added to an {{term(MTConnect Agent)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEVICE_REMOVED'>
        <xs:annotation>
          <xs:documentation>
            An {{block(Event)}} that provides the {{term(UUID)}} of a device
            removed from an {{term(MTConnect Agent)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEVICE_CHANGED'>
        <xs:annotation>
          <xs:documentation>
            An {{block(Event)}} that provides the {{term(UUID)}} of the device
            whose {{term(Metadata)}} has changed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONNECTION_STATUS'>
        <xs:annotation>
          <xs:documentation>
            The status of the connection between an {{term(Adapter)}} and an
            {{term(Agent)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ADAPTER_SOFTWARE_VERSION'>
        <xs:annotation>
          <xs:documentation>
            The originator’s software version of the {{term(Adapter)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ADAPTER_URI'>
        <xs:annotation>
          <xs:documentation>
            The {{term(URI)}} of the {{term(Adapter)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MTCONNECT_VERSION'>
        <xs:annotation>
          <xs:documentation>
            The reference version of the MTConnect Standard supported by the
            {{term(Adapter)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SENSOR_ATTACHMENT'>
        <xs:annotation>
          <xs:documentation>
            An {{block(Event)}} defining an {{term(Attachment)}} between a
            sensor and an entity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_STATUS'>
        <xs:annotation>
          <xs:documentation>
            State or condition of a part.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_OCCURRENCE_ID'>
        <xs:annotation>
          <xs:documentation>
            An identifier of a process being executed by the device.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_AGGREGATE_ID'>
        <xs:annotation>
          <xs:documentation>
            Identifier given to link the individual occurrence to a group of
            related occurrences, such as a process step in a process plan.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_KIND_ID'>
        <xs:annotation>
          <xs:documentation>
            Identifier given to link the individual occurrence to a class of
            processes or process definition. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_GROUP_ID'>
        <xs:annotation>
          <xs:documentation>
            Identifier given to a collection of individual parts. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_KIND_ID'>
        <xs:annotation>
          <xs:documentation>
            Identifier given to link the individual occurrence to a class of
            parts, typically distinguished by a particular part design.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_UNIQUE_ID'>
        <xs:annotation>
          <xs:documentation>
            Identifier given to a distinguishable, individual part. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTROL_LIMIT'>
        <xs:annotation>
          <xs:documentation>
            A set of limits used to indicate whether a process variable is
            stable and in control.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SPECIFICATION_LIMIT'>
        <xs:annotation>
          <xs:documentation>
            A set of limits defining a range of values designating acceptable
            performance for a variable.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ALARM_LIMIT'>
        <xs:annotation>
          <xs:documentation>
            A set of limits used to trigger warning or alarm indicators.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMMUNICATIONS'>
        <xs:annotation>
          <xs:documentation>
            An indication that the piece of equipment has experienced a
            communications failure.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DATA_RANGE'>
        <xs:annotation>
          <xs:documentation>
            An indication that the value of the data associated with a measured
            value or a calculation is outside of an expected range.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LOGIC_PROGRAM'>
        <xs:annotation>
          <xs:documentation>
            An indication that an error occurred in the logic program or
            programmable logic controller (PLC) associated with a piece of
            equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MOTION_PROGRAM'>
        <xs:annotation>
          <xs:documentation>
            An indication that an error occurred in the motion program
            associated with a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SYSTEM'>
        <xs:annotation>
          <xs:documentation>
            A general purpose indication associated with an electronic component
            of a piece of equipment or a controller that represents a fault that
            is not associated with the operator, program, or hardware.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTUATOR'>
        <xs:annotation>
          <xs:documentation>
            An indication of a fault associated with an actuator.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VARIABLE'>
        <xs:annotation>
          <xs:documentation>
            A user variable
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemEnumType'>
    <xs:annotation>
      <xs:documentation>
        The types of measurements available
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='DataItemEnumEnum DataItemEnumExtType'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemSubEnumExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The sub-types for a measurement
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemSubEnumEnum'>
    <xs:annotation>
      <xs:documentation>
        The sub-types for a measurement
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ABSOLUTE'>
        <xs:annotation>
          <xs:documentation>
            Relating to or derived in the simplest manner from the fundamental
            units or measurements.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTION'>
        <xs:annotation>
          <xs:documentation>
            An indication of the operating state of a mechanism.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTUAL'>
        <xs:annotation>
          <xs:documentation>
            The measured value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ALL'>
        <xs:annotation>
          <xs:documentation>
            The number of parts produced.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ALTERNATING'>
        <xs:annotation>
          <xs:documentation>
            The measurement of alternating voltage or current. If not specified
            further in statistic, defaults to RMS voltage. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='A_SCALE'>
        <xs:annotation>
          <xs:documentation>
            A Scale weighting factor.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AUXILIARY'>
        <xs:annotation>
          <xs:documentation>
            When multiple locations on a piece of bar stock being feed by a bar
            feeder are referenced as the indication of whether the end of that
            piece of bar stock has been reached.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BAD'>
        <xs:annotation>
          <xs:documentation>
            The number of parts produced that do not conform to specification.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BRINELL'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the resistance to deformation of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='B_SCALE'>
        <xs:annotation>
          <xs:documentation>
            B Scale weighting factor.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMMANDED'>
        <xs:annotation>
          <xs:documentation>
            The commanded value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONSUMED'>
        <xs:annotation>
          <xs:documentation>
            The amount of material consumed from an object or container during a
            manufacturing process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTROL'>
        <xs:annotation>
          <xs:documentation>
            The state of the enabling signal or control logic that enables or
            disables the function or operation of the structural element.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='C_SCALE'>
        <xs:annotation>
          <xs:documentation>
            C Scale weighting factor.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DELAY'>
        <xs:annotation>
          <xs:documentation>
            A piece of equipment or process waiting for an event or an action to
            occur.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DIRECT'>
        <xs:annotation>
          <xs:documentation>
            The measurement of DC current or voltage.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DRY_RUN'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection used to execute a test mode to
            confirm the execution of machine functions.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='D_SCALE'>
        <xs:annotation>
          <xs:documentation>
            D Scale weighting factor.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EXPIRATION'>
        <xs:annotation>
          <xs:documentation>
            The time and date code relating to the expiration or end of useful
            life for a material or other physical item.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FIRST_USE'>
        <xs:annotation>
          <xs:documentation>
            The time and date code relating the first use of a material or other
            physical item.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GOOD'>
        <xs:annotation>
          <xs:documentation>
            The number of parts produced that conform to specification.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCREMENTAL'>
        <xs:annotation>
          <xs:documentation>
            Relating to or derived from the last {{term(observation)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='JOG'>
        <xs:annotation>
          <xs:documentation>
            The feedrate specified by a logic or motion program when operating
            in a manual state or method (jogging).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LATERAL'>
        <xs:annotation>
          <xs:documentation>
            An indication of the position of a mechanism that may move in a
            lateral direction.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LEEB'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the elasticity of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LENGTH'>
        <xs:annotation>
          <xs:documentation>
            A reference to a length type tool offset variable.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINE'>
        <xs:annotation>
          <xs:documentation>
            The state of the power source.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINEAR'>
        <xs:annotation>
          <xs:documentation>
            The direction of motion of a linear motion.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LOADED'>
        <xs:annotation>
          <xs:documentation>
            Subparts of a piece of equipment are under load.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MACHINE_AXIS_LOCK'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection that changes the behavior of the
            controller on a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAIN'>
        <xs:annotation>
          <xs:documentation>
            Relating to the primary logic or motion program currently being
            executed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAINTENANCE'>
        <xs:annotation>
          <xs:documentation>
            Relating to maintenance on the piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MANUAL_UNCLAMP'>
        <xs:annotation>
          <xs:documentation>
            An indication of the state of an operator controlled interlock that
            can inhibit the ability to initiate an unclamp action of an
            electronically controlled chuck.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MANUFACTURE'>
        <xs:annotation>
          <xs:documentation>
            Related to the production of a material or other physical item.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAXIMUM'>
        <xs:annotation>
          <xs:documentation>
            The maximum value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MINIMUM'>
        <xs:annotation>
          <xs:documentation>
            The minimum value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MOHS'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the resistance to scratching of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MOTION'>
        <xs:annotation>
          <xs:documentation>
            An indication of the open or closed state of a mechanism.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NO_SCALE'>
        <xs:annotation>
          <xs:documentation>
            No weighting factor on the frequency scale.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPERATING'>
        <xs:annotation>
          <xs:documentation>
            A piece of equipment that is powered or performing any activity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPERATOR'>
        <xs:annotation>
          <xs:documentation>
            Relating to the person currently responsible for operating the piece
            of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPTIONAL_STOP'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection that changes the behavior of the
            controller on a piece of equipment. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OVERRIDE'>
        <xs:annotation>
          <xs:documentation>
            The overridden value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWERED'>
        <xs:annotation>
          <xs:documentation>
            A piece of equipment is powered and functioning or
            {{termplural(Component)}} that are required to remain on are
            powered.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRIMARY'>
        <xs:annotation>
          <xs:documentation>
            The main or most important location **MUST** be designated as the
            end of a piece of bar stock.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROBE'>
        <xs:annotation>
          <xs:documentation>
            The value provided by a measurement probe.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS'>
        <xs:annotation>
          <xs:documentation>
            Relating to production of a part or product on a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAMMED'>
        <xs:annotation>
          <xs:documentation>
            The programmed value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RADIAL'>
        <xs:annotation>
          <xs:documentation>
            A reference to a radial type tool offset variable.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RAPID'>
        <xs:annotation>
          <xs:documentation>
            The feedrate specified by a logic or motion program when operating
            in a rapid positioning mode.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REMAINING'>
        <xs:annotation>
          <xs:documentation>
            The remaining measure of an object or an action.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROCKWELL'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the resistance to deformation of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROTARY'>
        <xs:annotation>
          <xs:documentation>
            The direction of a rotary motion using the right hand rule
            convention.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SCHEDULE'>
        <xs:annotation>
          <xs:documentation>
            The identity of a control program that is used to specify the order
            of execution of other programs.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SET_UP'>
        <xs:annotation>
          <xs:documentation>
            Relating to the preparation of a piece of equipment for production
            or restoring the piece of equipment to a neutral state after
            production.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SHORE'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the resistance to deformation of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SINGLE_BLOCK'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection that changes the behavior of the
            controller on a piece of equipment. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STANDARD'>
        <xs:annotation>
          <xs:documentation>
            The standard measure of an object or an action.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='START'>
        <xs:annotation>
          <xs:documentation>
            Relating to the beginning of an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SWITCHED'>
        <xs:annotation>
          <xs:documentation>
            An indication of the activation state of a mechanism represented by
            a {{term(Composition)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TARGET'>
        <xs:annotation>
          <xs:documentation>
            The targeted or desired value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TARGET_COMPLETION'>
        <xs:annotation>
          <xs:documentation>
            Relating to the end or completion of an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_CHANGE_STOP'>
        <xs:annotation>
          <xs:documentation>
            A setting or operator selection that changes the behavior of the
            controller on a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='USEABLE'>
        <xs:annotation>
          <xs:documentation>
            The remaining usable measure of an object or action.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VERTICAL'>
        <xs:annotation>
          <xs:documentation>
            An indication of the position of a mechanism that may move in a
            vertical direction.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VICKERS'>
        <xs:annotation>
          <xs:documentation>
            A scale to measure the resistance to deformation of a surface.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WORKING'>
        <xs:annotation>
          <xs:documentation>
            A piece of equipment performing any activity, the equipment is
            active and performing a function under load or not.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='IPV4_ADDRESS'>
        <xs:annotation>
          <xs:documentation>
            The IPV4 network address of the component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='IPV6_ADDRESS'>
        <xs:annotation>
          <xs:documentation>
            The IPV6 network address of the component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GATEWAY'>
        <xs:annotation>
          <xs:documentation>
            The Gateway for the component network.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SUBNET_MASK'>
        <xs:annotation>
          <xs:documentation>
            The SubNet mask for the component network. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VLAN_ID'>
        <xs:annotation>
          <xs:documentation>
            The layer2 Virtual Local Network (VLAN) ID for the component
            network.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAC_ADDRESS'>
        <xs:annotation>
          <xs:documentation>
            Media Access Control Address. The unique physical address of the
            network hardware.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WIRELESS'>
        <xs:annotation>
          <xs:documentation>
            Identifies whether the connection type is wireless.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LICENSE'>
        <xs:annotation>
          <xs:documentation>
            The license code to validate or activate the hardware or software.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VERSION'>
        <xs:annotation>
          <xs:documentation>
            The version of the hardware or software. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RELEASE_DATE'>
        <xs:annotation>
          <xs:documentation>
            The date the hardware or software was released for general use.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INSTALL_DATE'>
        <xs:annotation>
          <xs:documentation>
            The date the hardware or software was installed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MANUFACTURER'>
        <xs:annotation>
          <xs:documentation>
            The corporate identity for the maker of the hardware or software.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UUID'>
        <xs:annotation>
          <xs:documentation>
            The globally unique identifier as specified in ISO 11578 or RFC
            4122.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SERIAL_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            A serial number that uniquely identifies a specific part.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RAW_MATERIAL'>
        <xs:annotation>
          <xs:documentation>
            A singular piece of material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LOT'>
        <xs:annotation>
          <xs:documentation>
            A group of parts tracked as a lot.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BATCH'>
        <xs:annotation>
          <xs:documentation>
            A group of parts produced in a batch.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HEAT_TREAT'>
        <xs:annotation>
          <xs:documentation>
            A material heat number.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            A particular part design or model.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_FAMILY'>
        <xs:annotation>
          <xs:documentation>
            A group of parts having similarities in geometry, manufacturing
            process, and/or functions.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_NAME'>
        <xs:annotation>
          <xs:documentation>
            A word or set of words by which a part is known, addressed, or
            referred to.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_STEP'>
        <xs:annotation>
          <xs:documentation>
            A step in the process plan that this occurrence corresponds to. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_PLAN'>
        <xs:annotation>
          <xs:documentation>
            A process plan that a process occurrence belongs to.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ORDER_NUMBER'>
        <xs:annotation>
          <xs:documentation>
            The authorization of a process occurrence.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_NAME'>
        <xs:annotation>
          <xs:documentation>
            A word or set of words by which a process being executed (process
            occurrence) by the device is known, addressed, or referred to. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ISO_STEP_EXECUTABLE'>
        <xs:annotation>
          <xs:documentation>
            A reference to a ISO 10303 Executable.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMPLETE'>
        <xs:annotation>
          <xs:documentation>
            Associated with the completion of an activity or event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTIVE'>
        <xs:annotation>
          <xs:documentation>
            Relating to logic or motion program currently executing.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemSubEnumType'>
    <xs:annotation>
      <xs:documentation>
        The sub-types for a measurement
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='DataItemSubEnumEnum DataItemSubEnumExtType'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemStatisticsExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for Statistical operations on data
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemStatisticsEnum'>
    <xs:annotation>
      <xs:documentation>
        Statistical operations on data
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='AVERAGE'>
        <xs:annotation>
          <xs:documentation>
            Mathematical Average value calculated for the data item during the
            calculation period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KURTOSIS'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** in *Version 1.6*. ~~A measure of the
            &quot;peakedness&quot; of a probability distribution; i.e., the
            shape of the distribution curve.~~
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAXIMUM'>
        <xs:annotation>
          <xs:documentation>
            Maximum or peak value recorded for the data item during the
            calculation period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MEDIAN'>
        <xs:annotation>
          <xs:documentation>
            The middle number of a series of numbers.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MINIMUM'>
        <xs:annotation>
          <xs:documentation>
            Minimum value recorded for the data item during the calculation
            period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MODE'>
        <xs:annotation>
          <xs:documentation>
            The number in a series of numbers that occurs most often.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RANGE'>
        <xs:annotation>
          <xs:documentation>
            Difference between the maximum and minimum value of a data item
            during the calculation period. Also represents Peak-to-Peak
            measurement in a waveform.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ROOT_MEAN_SQUARE'>
        <xs:annotation>
          <xs:documentation>
            Mathematical Root Mean Square (RMS) value calculated for the data
            item during the calculation period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STANDARD_DEVIATION'>
        <xs:annotation>
          <xs:documentation>
            Statistical Standard Deviation value calculated for the data item
            during the calculation period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemStatisticsType'>
    <xs:annotation>
      <xs:documentation>
        Statistical operations on data
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='DataItemStatisticsEnum DataItemStatisticsExtType'/>
  </xs:simpleType>
  <xs:simpleType name='UnitsExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The units supported
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='UnitsEnum'>
    <xs:annotation>
      <xs:documentation>
        The units supported
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='AMPERE'>
        <xs:annotation>
          <xs:documentation>
            Amps
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CELSIUS'>
        <xs:annotation>
          <xs:documentation>
            Degrees Celsius
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COUNT'>
        <xs:annotation>
          <xs:documentation>
            A count of something.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DECIBEL'>
        <xs:annotation>
          <xs:documentation>
            Sound Level
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE'>
        <xs:annotation>
          <xs:documentation>
            Angle in degrees
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE_3D'>
        <xs:annotation>
          <xs:documentation>
            A space-delimited, floating-point representation of the angular
            rotation in degrees around the X, Y, and Z axes relative to a
            cartesian coordinate system respectively in order as A, B, and C. If
            any of the rotations is not known, it **MUST** be zero (0).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Angular degrees per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Angular acceleration in degrees per second squared
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HERTZ'>
        <xs:annotation>
          <xs:documentation>
            Frequency measured in cycles per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='JOULE'>
        <xs:annotation>
          <xs:documentation>
            A measurement of energy.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KILOGRAM'>
        <xs:annotation>
          <xs:documentation>
            Kilograms
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER'>
        <xs:annotation>
          <xs:documentation>
            Measurement of volume of a fluid
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Liters per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MICRO_RADIAN'>
        <xs:annotation>
          <xs:documentation>
            Measurement of Tilt
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Millimeters
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER_3D'>
        <xs:annotation>
          <xs:documentation>
            A point in space identified by X, Y, and Z positions and represented
            by a space-delimited set of numbers each expressed in millimeters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/REVOLUTION'>
        <xs:annotation>
          <xs:documentation>
            Millimeters per revolution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Millimeters per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Acceleration in millimeters per second squared
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NEWTON'>
        <xs:annotation>
          <xs:documentation>
            Force in Newtons
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NEWTON_METER'>
        <xs:annotation>
          <xs:documentation>
            Torque, a unit for force times distance.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OHM'>
        <xs:annotation>
          <xs:documentation>
            Measure of Electrical Resistance
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL'>
        <xs:annotation>
          <xs:documentation>
            Pressure in Newtons per square meter
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL_SECOND'>
        <xs:annotation>
          <xs:documentation>
            Measurement of Viscosity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PERCENT'>
        <xs:annotation>
          <xs:documentation>
            Percentage
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PH'>
        <xs:annotation>
          <xs:documentation>
            A measure of the acidity or alkalinity of a solution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per minute
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SECOND'>
        <xs:annotation>
          <xs:documentation>
            A measurement of time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SIEMENS/METER'>
        <xs:annotation>
          <xs:documentation>
            A measurement of Electrical Conductivity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT'>
        <xs:annotation>
          <xs:documentation>
            Volts
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the apparent power in an electrical circuit,
            equal to the product of root-mean-square (RMS) voltage and RMS
            current (commonly referred to as VA).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE_REACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of reactive power in an AC electrical circuit
            (commonly referred to as VAR).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATT'>
        <xs:annotation>
          <xs:documentation>
            Watts
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATT_SECOND'>
        <xs:annotation>
          <xs:documentation>
            Measurement of electrical energy, equal to one Joule
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GRAM/CUBIC_METER'>
        <xs:annotation>
          <xs:documentation>
            Gram per cubic meter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Geometric volume in millimeters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Change of geometric volume per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Change in geometric volume per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIGRAM'>
        <xs:annotation>
          <xs:documentation>
            Milligram.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIGRAM/CUBIC_MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Milligram per cubic millimeter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLILITER'>
        <xs:annotation>
          <xs:documentation>
            Milliliter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COUNT/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Counts per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Pascal per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNIT_VECTOR_3D'>
        <xs:annotation>
          <xs:documentation>
            A 3D Unit Vector. Space delimited list of three floating point
            numbers.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='UnitsType'>
    <xs:annotation>
      <xs:documentation>
        The units supported
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='UnitsEnum UnitsExtType'/>
  </xs:simpleType>
  <xs:simpleType name='NativeUnitsExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The units supported for the source equipment that can
        be converted into MTC Units.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='NativeUnitsEnum'>
    <xs:annotation>
      <xs:documentation>
        The units supported for the source equipment that can be converted into
        MTC Units.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='AMPERE'>
        <xs:annotation>
          <xs:documentation>
            Amps
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CELSIUS'>
        <xs:annotation>
          <xs:documentation>
            Degrees Celsius
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COUNT'>
        <xs:annotation>
          <xs:documentation>
            A count of something.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DECIBEL'>
        <xs:annotation>
          <xs:documentation>
            Sound Level
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE'>
        <xs:annotation>
          <xs:documentation>
            Angle in degrees
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE_3D'>
        <xs:annotation>
          <xs:documentation>
            A space-delimited, floating-point representation of the angular
            rotation in degrees around the X, Y, and Z axes relative to a
            cartesian coordinate system respectively in order as A, B, and C. If
            any of the rotations is not known, it **MUST** be zero (0).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Angular degrees per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Angular acceleration in degrees per second squared
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HERTZ'>
        <xs:annotation>
          <xs:documentation>
            Frequency measured in cycles per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='JOULE'>
        <xs:annotation>
          <xs:documentation>
            A measurement of energy.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KILOGRAM'>
        <xs:annotation>
          <xs:documentation>
            Kilograms
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER'>
        <xs:annotation>
          <xs:documentation>
            Measurement of volume of a fluid
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Liters per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MICRO_RADIAN'>
        <xs:annotation>
          <xs:documentation>
            Measurement of Tilt
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Millimeters
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER_3D'>
        <xs:annotation>
          <xs:documentation>
            A point in space identified by X, Y, and Z positions and represented
            by a space-delimited set of numbers each expressed in millimeters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/REVOLUTION'>
        <xs:annotation>
          <xs:documentation>
            Millimeters per revolution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Millimeters per second
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Acceleration in millimeters per second squared
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NEWTON'>
        <xs:annotation>
          <xs:documentation>
            Force in Newtons
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NEWTON_METER'>
        <xs:annotation>
          <xs:documentation>
            Torque, a unit for force times distance.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OHM'>
        <xs:annotation>
          <xs:documentation>
            Measure of Electrical Resistance
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL'>
        <xs:annotation>
          <xs:documentation>
            Pressure in Newtons per square meter
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL_SECOND'>
        <xs:annotation>
          <xs:documentation>
            Measurement of Viscosity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PERCENT'>
        <xs:annotation>
          <xs:documentation>
            Percentage
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PH'>
        <xs:annotation>
          <xs:documentation>
            A measure of the acidity or alkalinity of a solution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per minute
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SECOND'>
        <xs:annotation>
          <xs:documentation>
            A measurement of time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SIEMENS/METER'>
        <xs:annotation>
          <xs:documentation>
            A measurement of Electrical Conductivity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT'>
        <xs:annotation>
          <xs:documentation>
            Volts
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of the apparent power in an electrical circuit,
            equal to the product of root-mean-square (RMS) voltage and RMS
            current (commonly referred to as VA).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VOLT_AMPERE_REACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The measurement of reactive power in an AC electrical circuit
            (commonly referred to as VAR).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATT'>
        <xs:annotation>
          <xs:documentation>
            Watts
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATT_SECOND'>
        <xs:annotation>
          <xs:documentation>
            Measurement of electrical energy, equal to one Joule
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Revolutions per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GRAM/CUBIC_METER'>
        <xs:annotation>
          <xs:documentation>
            Gram per cubic meter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Geometric volume in millimeters.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Change of geometric volume per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CUBIC_MILLIMETER/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Change in geometric volume per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIGRAM'>
        <xs:annotation>
          <xs:documentation>
            Milligram.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIGRAM/CUBIC_MILLIMETER'>
        <xs:annotation>
          <xs:documentation>
            Milligram per cubic millimeter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLILITER'>
        <xs:annotation>
          <xs:documentation>
            Milliliter.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COUNT/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Counts per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Pascal per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNIT_VECTOR_3D'>
        <xs:annotation>
          <xs:documentation>
            A 3D Unit Vector. Space delimited list of three floating point
            numbers.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CENTIPOISE'>
        <xs:annotation>
          <xs:documentation>
            A measure of viscosity.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DEGREE/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Rotational velocity in degrees per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FAHRENHEIT'>
        <xs:annotation>
          <xs:documentation>
            Temperature in Fahrenheit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FOOT'>
        <xs:annotation>
          <xs:documentation>
            Feet.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FOOT/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Feet per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FOOT/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Feet per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FOOT/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Acceleration in feet per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FOOT_3D'>
        <xs:annotation>
          <xs:documentation>
            A point in space identified by X, Y, and Z positions and represented
            by a space-delimited set of numbers each expressed in feet.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GALLON/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Gallons per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HOUR'>
        <xs:annotation>
          <xs:documentation>
            A measurement of time in hours.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH'>
        <xs:annotation>
          <xs:documentation>
            Inches.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Inches per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Inches per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Acceleration in inches per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH_POUND'>
        <xs:annotation>
          <xs:documentation>
            A measure of torque in inch pounds.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INCH_3D'>
        <xs:annotation>
          <xs:documentation>
            A point in space identified by X, Y, and Z positions and represented
            by a space-delimited set of numbers each expressed in inches.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KELVIN'>
        <xs:annotation>
          <xs:documentation>
            A measurement of temperature.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KILOWATT'>
        <xs:annotation>
          <xs:documentation>
            A measurement in kilowatt.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='KILOWATT_HOUR'>
        <xs:annotation>
          <xs:documentation>
            Kilowatt hours which is 3.6 mega joules.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER'>
        <xs:annotation>
          <xs:documentation>
            Measurement of volume of a fluid.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LITER/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Measurement of rate of flow of a fluid.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Velocity in millimeters per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MINUTE'>
        <xs:annotation>
          <xs:documentation>
            A measurement of time in minutes.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OTHER'>
        <xs:annotation>
          <xs:documentation>
            Unsupported units.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POUND'>
        <xs:annotation>
          <xs:documentation>
            US pounds.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POUND/INCH^2'>
        <xs:annotation>
          <xs:documentation>
            Pressure in pounds per square inch (PSI).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RADIAN'>
        <xs:annotation>
          <xs:documentation>
            Angle in radians.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RADIAN/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Velocity in radians per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RADIAN/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Rotational acceleration in radian per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RADIAN/SECOND^2'>
        <xs:annotation>
          <xs:documentation>
            Rotational acceleration in radian per second squared.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REVOLUTION/SECOND'>
        <xs:annotation>
          <xs:documentation>
            Rotational velocity in revolution per second.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BAR'>
        <xs:annotation>
          <xs:documentation>
            Pressure in Bar.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TORR'>
        <xs:annotation>
          <xs:documentation>
            Pressure in Torr.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MILLIMETER_MERCURY'>
        <xs:annotation>
          <xs:documentation>
            Pressure in Millimeter of Mercury (mmHg).
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PASCAL/MINUTE'>
        <xs:annotation>
          <xs:documentation>
            Pascal per minute.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='NativeUnitsType'>
    <xs:annotation>
      <xs:documentation>
        The units supported for the source equipment that can be converted into
        MTC Units.
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='NativeUnitsEnum NativeUnitsExtType'/>
  </xs:simpleType>
  <xs:simpleType name='CoordinateSystemEnumType'>
    <xs:annotation>
      <xs:documentation>
        The coordinate system to be used for the position
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='MACHINE'>
        <xs:annotation>
          <xs:documentation>
            An unchangeable coordinate system that has machine zero as its
            origin.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WORK'>
        <xs:annotation>
          <xs:documentation>
            The coordinate system that represents the working area for a
            particular workpiece whose origin is shifted within the `MACHINE`
            coordinate system. If the `WORK` coordinates are not currently
            defined in the piece of equipment, the `MACHINE` coordinates will be
            used.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemResetValueExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The reset intervals
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:pattern value='[a-ln-z][a-z]*:[A-Z_0-9]+'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemResetValueEnum'>
    <xs:annotation>
      <xs:documentation>
        The reset intervals
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTION_COMPLETE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} that is measuring an action or
            operation is to be reset upon completion of that action or
            operation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ANNUAL'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset at the end of a
            12-month period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DAY'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset at the end of a
            24-hour period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LIFE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is not reset and accumulates
            for the entire life of the piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAINTENANCE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset upon completion
            of a maintenance event.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MONTH'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset at the end of a
            monthly period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWER_ON'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset when power was
            applied to the piece of equipment after a planned or unplanned
            interruption of power has occurred.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SHIFT'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset at the end of a
            work shift.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WEEK'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Item)}} is to be reset at the end of a
            7-day period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemResetValueType'>
    <xs:annotation>
      <xs:documentation>
        The reset intervals
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='DataItemResetValueEnum DataItemResetValueExtType'/>
  </xs:simpleType>
  <xs:attributeGroup name='HeaderAttributesType'>
    <xs:attribute name='version' type='VersionType' use='required'>
      <xs:annotation>
        <xs:documentation>
          unique identifier of the administered item. {{cite(ISO/IEC
          11179-:2015)}}
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='creationTime' type='CreationTimeType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The time the file was created.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='testIndicator' type='TestIndicatorType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          Indicates that this was a test document
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='instanceId' type='InstanceIdType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The unique instance identifier of this agent process
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sender' type='SenderType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The sender of the message
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='deviceModelChangeTime' type='DeviceModelChangeTimeType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A timestamp in 8601 format of the last update of the Device
          information for any device
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:attributeGroup>
  <xs:simpleType name='StationType'>
    <xs:annotation>
      <xs:documentation>
        The station id for this device
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:complexType name='HeaderType'>
    <xs:annotation>
      <xs:documentation>
        Supplemental data usually placed at the beginning of a
        {{term(Document)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='xs:string'>
        <xs:attributeGroup ref='HeaderAttributesType'/>
        <xs:attribute name='bufferSize' type='BufferSizeType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The size of the agent&apos;s buffer.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='nextSequence' type='SequenceType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The next sequence number for subsequent requests
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='lastSequence' type='SequenceType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The last sequence number available from the agent
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='firstSequence' type='SequenceType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The first sequence number available from the agent
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='MTConnectStreamsType'>
    <xs:annotation>
      <xs:documentation>
        The root node for MTConnect
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Header' type='HeaderType'>
        <xs:annotation>
          <xs:documentation>
            Supplemental data usually placed at the beginning of a
            {{term(Document)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Streams' type='StreamsType'>
        <xs:annotation>
          <xs:documentation>
            Structural Elements for MTConnectStreams
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='ResultValueType'>
    <xs:annotation>
      <xs:documentation>
        An events data
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemIdType'>
    <xs:annotation>
      <xs:documentation>
        The item&apos;s unique ID that references the data item id from probe
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:NMTOKEN'/>
  </xs:simpleType>
  <xs:simpleType name='NativeCodeType'>
    <xs:annotation>
      <xs:documentation>
        An Condition code as defined by the component
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:complexType name='StreamsType'>
    <xs:annotation>
      <xs:documentation>
        Structural Elements for MTConnectStreams
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='DeviceStream' type='DeviceStreamType' minOccurs='0' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            {{block(DeviceStream)}} {{termplural(organize)}} data reported from
            a single piece of equipment. A {{block(DeviceStream)}} element
            **MUST** be provided for each piece of equipment reporting data in
            an {{block(MTConnectStreams)}} {{term(Response Document)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='DeviceStreamType'>
    <xs:annotation>
      <xs:documentation>
        {{block(DeviceStream)}} {{termplural(organize)}} data reported from a
        single piece of equipment. A {{block(DeviceStream)}} element **MUST** be
        provided for each piece of equipment reporting data in an
        {{block(MTConnectStreams)}} {{term(Response Document)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='ComponentStream' type='ComponentStreamType' minOccurs='0' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            See the following {{sect(ComponentStream)}} for details.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attribute name='name' type='NameType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The component name
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='uuid' type='UuidType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The unque identifier for this device
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:complexType name='ComponentStreamType'>
    <xs:annotation>
      <xs:documentation>
        See the following {{sect(ComponentStream)}} for details.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Samples' type='SamplesType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Samples)}} {{termplural(organize)}} the {{block(Sample)}}
            elements. See {{sect(Sample)}} for details on the {{block(Sample)}}
            model.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Events' type='EventsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Events)}} {{termplural(organize)}} the {{block(Event)}}
            elements. See {{sect(Event)}} for details on the {{block(Event)}}
            model.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Condition' type='ConditionListType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            An indicator of the ability of a piece of equipment or
            {{term(Component)}} to function to specification.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attribute name='componentId' type='ComponentIdType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The id of the component (maps to the id from probe)
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The component name
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='nativeName' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The device manufacturer component name
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='component' type='NameType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A {{term(Structural Element)}} that represents a physical or logical
          part or subpart of a piece of equipment.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='uuid' type='UuidType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The unque identifier for this component
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:complexType name='SamplesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Samples)}} {{termplural(organize)}} the {{block(Sample)}}
        elements. See {{sect(Sample)}} for details on the {{block(Sample)}}
        model.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='Sample' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='EventsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Events)}} {{termplural(organize)}} the {{block(Event)}}
        elements. See {{sect(Event)}} for details on the {{block(Event)}} model.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='Event' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='ConditionListType'>
    <xs:annotation>
      <xs:documentation>
        A collection of conditions
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='Condition' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='UnavailableValueType'>
    <xs:annotation>
      <xs:documentation>
        The observation value for indeterminent data
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Data is unavailable
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:attributeGroup name='ObservationType'>
    <xs:attribute name='sequence' type='SequenceType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The events sequence number
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='subType' type='DataItemSubEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The event subtype corresponding to the measurement subtype
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='timestamp' type='TimestampType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The time the event occurred or recorded
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The name of the event corresponding to the measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='dataItemId' type='DataItemIdType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The unique identifier of the item being produced
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='compositionId' type='CompositionIdType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The identifier of the sub-element this result is in reference to
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:attributeGroup>
  <xs:simpleType name='SampleRateType'>
    <xs:annotation>
      <xs:documentation>
        The target rate a value can be sampled
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='CountValueType'>
    <xs:annotation>
      <xs:documentation>
        The number of items in the list
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'/>
  </xs:simpleType>
  <xs:simpleType name='FloatSampleValueType'>
    <xs:annotation>
      <xs:documentation>
        Common floating point sample value
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='xs:float UnavailableValueType'/>
  </xs:simpleType>
  <xs:simpleType name='ThreeSpaceSampleValueType'>
    <xs:annotation>
      <xs:documentation>
        Common floating point sample value
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='ThreeSpaceValueType UnavailableValueType'/>
  </xs:simpleType>
  <xs:complexType name='SampleType' abstract='true' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        The collection of one or more pieces of information. 
      </xs:documentation>
    </xs:annotation>
    <xs:attributeGroup ref='ObservationType'/>
    <xs:attribute name='sampleRate' type='SampleRateType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The rate the waveform was sampled at, default back to the value given
          in the data item
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='resetTriggered' type='DataItemResetValueType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          An optional indicator that the event or sample was reset
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='statistic' type='DataItemStatisticsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The statistical operation on this data
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='duration' type='DurationTimeType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The number of seconds since the reset of the statistic
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Sample' type='SampleType'>
    <xs:annotation>
      <xs:documentation>
        The collection of one or more pieces of information. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CommonSampleType'>
    <xs:annotation>
      <xs:documentation>
        A sample with a single floating point value
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='SampleType'>
        <xs:simpleType>
          <xs:restriction base='FloatSampleValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CommonSample' type='CommonSampleType' substitutionGroup='Sample'>
    <xs:annotation>
      <xs:documentation>
        A sample with a single floating point value
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ThreeSpaceSampleType'>
    <xs:annotation>
      <xs:documentation>
        A sample with a three tuple floating point value
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='SampleType'>
        <xs:simpleType>
          <xs:restriction base='ThreeSpaceSampleValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ThreeSpaceSample' type='ThreeSpaceSampleType' substitutionGroup='Sample'>
    <xs:annotation>
      <xs:documentation>
        A sample with a three tuple floating point value
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AbsTimeSeriesType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        The abstract waveform
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SampleType'>
        <xs:attribute name='sampleCount' type='CountValueType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The number of samples
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element abstract='true' name='AbsTimeSeries' type='AbsTimeSeriesType' substitutionGroup='Sample'>
    <xs:annotation>
      <xs:documentation>
        The abstract waveform
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TimeSeriesType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
         A {{block(DataItem)}} with `TIME_SERIES` {{property(representation)}}
        **MUST** have a {{property(category)}} of `SAMPLE`. A *Time Series*
        {{term(observation)}} **MUST** have a {{property(sampleCount)}}
        attribute. *Time Series* {{term(observation)}} **MUST** report multiple
        values at fixed intervals in a single {{term(observation)}}. At minimum,
        one of DataItem or {{term(observation)}} **MUST** specify the
        {{property(sampleRate)}} in Hertz (values/second); fractional rates are
        permitted. When the {{term(observation)}} and the {{block(DataItem)}}
        specify the {{property(sampleRate)}}, the {{term(observation)}}
        {{property(sampleRate)}} supersedes the {{block(DataItem)}}. The
        {{term(observation)}} **MUST** set the {{property(timestamp)}} to the
        time the last value was observed. The {{property(duration)}} **MAY**
        indicate the time interval from the first to the last value in the
        series. {{sect(Attributes of TimeSeries)}} defines additional attributes
        provided for a {{block(DataItem)}} of `category` `SAMPLE` with a
        {{property(representation)}} attribute of `TIME_SERIES`.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='AbsTimeSeriesType'>
        <xs:simpleType>
          <xs:restriction base='FloatListValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element abstract='true' name='TimeSeries' type='TimeSeriesType' substitutionGroup='AbsTimeSeries'>
    <xs:annotation>
      <xs:documentation>
         A {{block(DataItem)}} with `TIME_SERIES` {{property(representation)}}
        **MUST** have a {{property(category)}} of `SAMPLE`. A *Time Series*
        {{term(observation)}} **MUST** have a {{property(sampleCount)}}
        attribute. *Time Series* {{term(observation)}} **MUST** report multiple
        values at fixed intervals in a single {{term(observation)}}. At minimum,
        one of DataItem or {{term(observation)}} **MUST** specify the
        {{property(sampleRate)}} in Hertz (values/second); fractional rates are
        permitted. When the {{term(observation)}} and the {{block(DataItem)}}
        specify the {{property(sampleRate)}}, the {{term(observation)}}
        {{property(sampleRate)}} supersedes the {{block(DataItem)}}. The
        {{term(observation)}} **MUST** set the {{property(timestamp)}} to the
        time the last value was observed. The {{property(duration)}} **MAY**
        indicate the time interval from the first to the last value in the
        series. {{sect(Attributes of TimeSeries)}} defines additional attributes
        provided for a {{block(DataItem)}} of `category` `SAMPLE` with a
        {{property(representation)}} attribute of `TIME_SERIES`.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AccelerationType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the rate of change of velocity.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Acceleration' type='AccelerationType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the rate of change of velocity.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AccelerationTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the rate of change of velocity.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AccelerationTimeSeries' type='AccelerationTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the rate of change of velocity.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AccumulatedTimeType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of accumulated time for an activity or event.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AccumulatedTime' type='AccumulatedTimeType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of accumulated time for an activity or event.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AccumulatedTimeTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of accumulated time for an activity or
        event.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AccumulatedTimeTimeSeries' type='AccumulatedTimeTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of accumulated time for an activity or
        event.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AmperageType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.6*. Replaced by {{block(AmperageAC)}} and
        {{block(AmperageDC)}}. The measurement of electrical current.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Amperage' type='AmperageType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.6*. Replaced by {{block(AmperageAC)}} and
        {{block(AmperageDC)}}. The measurement of electrical current.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AmperageTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of **DEPRECATED** in *Version 1.6*. Replaced by
        {{block(AmperageAC)}} and {{block(AmperageDC)}}. The measurement of
        electrical current.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AmperageTimeSeries' type='AmperageTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of **DEPRECATED** in *Version 1.6*. Replaced by
        {{block(AmperageAC)}} and {{block(AmperageDC)}}. The measurement of
        electrical current.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AngleType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of angular position.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Angle' type='AngleType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of angular position.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AngleTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of angular position.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AngleTimeSeries' type='AngleTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of angular position.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AngularAccelerationType'>
    <xs:annotation>
      <xs:documentation>
        The measurement rate of change of angular velocity.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AngularAcceleration' type='AngularAccelerationType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement rate of change of angular velocity.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AngularAccelerationTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement rate of change of angular velocity.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AngularAccelerationTimeSeries' type='AngularAccelerationTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement rate of change of angular velocity.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AngularVelocityType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the rate of change of angular position.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AngularVelocity' type='AngularVelocityType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the rate of change of angular position.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AngularVelocityTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the rate of change of angular
        position.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AngularVelocityTimeSeries' type='AngularVelocityTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the rate of change of angular
        position.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AxisFeedrateType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the feedrate of a linear axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AxisFeedrate' type='AxisFeedrateType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the feedrate of a linear axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AxisFeedrateTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the feedrate of a linear axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AxisFeedrateTimeSeries' type='AxisFeedrateTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the feedrate of a linear axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CapacityFluidType'>
    <xs:annotation>
      <xs:documentation>
        The fluid capacity of an object or container.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CapacityFluid' type='CapacityFluidType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The fluid capacity of an object or container.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CapacityFluidTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The fluid capacity of an object or container.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CapacityFluidTimeSeries' type='CapacityFluidTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The fluid capacity of an object or container.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CapacitySpatialType'>
    <xs:annotation>
      <xs:documentation>
        The geometric capacity of an object or container.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CapacitySpatial' type='CapacitySpatialType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The geometric capacity of an object or container.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CapacitySpatialTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The geometric capacity of an object or container.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CapacitySpatialTimeSeries' type='CapacitySpatialTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The geometric capacity of an object or container.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ClockTimeType'>
    <xs:annotation>
      <xs:documentation>
        The value provided by a timing device at a specific point in time.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ClockTime' type='ClockTimeType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The value provided by a timing device at a specific point in time.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ClockTimeTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The value provided by a timing device at a specific point
        in time.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ClockTimeTimeSeries' type='ClockTimeTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The value provided by a timing device at a specific point
        in time.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ConcentrationType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the percentage of one component within a mixture of
        components
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Concentration' type='ConcentrationType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the percentage of one component within a mixture of
        components
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ConcentrationTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the percentage of one component within
        a mixture of components
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ConcentrationTimeSeries' type='ConcentrationTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the percentage of one component within
        a mixture of components
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ConductivityType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the ability of a material to conduct electricity.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Conductivity' type='ConductivityType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the ability of a material to conduct electricity.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ConductivityTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the ability of a material to conduct
        electricity.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ConductivityTimeSeries' type='ConductivityTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the ability of a material to conduct
        electricity.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CuttingSpeedType'>
    <xs:annotation>
      <xs:documentation>
        The speed difference (relative velocity) between the cutting mechanism
        and the surface of the workpiece it is operating on.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CuttingSpeed' type='CuttingSpeedType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The speed difference (relative velocity) between the cutting mechanism
        and the surface of the workpiece it is operating on.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CuttingSpeedTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The speed difference (relative velocity) between the
        cutting mechanism and the surface of the workpiece it is operating on.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CuttingSpeedTimeSeries' type='CuttingSpeedTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The speed difference (relative velocity) between the
        cutting mechanism and the surface of the workpiece it is operating on.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DensityType'>
    <xs:annotation>
      <xs:documentation>
        The volumetric mass of a material per unit volume of that material.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Density' type='DensityType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The volumetric mass of a material per unit volume of that material.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DensityTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The volumetric mass of a material per unit volume of that
        material.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DensityTimeSeries' type='DensityTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The volumetric mass of a material per unit volume of that
        material.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionAccelerationVolumetricType'>
    <xs:annotation>
      <xs:documentation>
        The rate of change in spatial volume of material deposited in an
        additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DepositionAccelerationVolumetric' type='DepositionAccelerationVolumetricType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The rate of change in spatial volume of material deposited in an
        additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionAccelerationVolumetricTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The rate of change in spatial volume of material
        deposited in an additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DepositionAccelerationVolumetricTimeSeries' type='DepositionAccelerationVolumetricTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The rate of change in spatial volume of material
        deposited in an additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionDensityType'>
    <xs:annotation>
      <xs:documentation>
        The density of the material deposited in an additive manufacturing
        process per unit of volume.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DepositionDensity' type='DepositionDensityType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The density of the material deposited in an additive manufacturing
        process per unit of volume.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionDensityTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The density of the material deposited in an additive
        manufacturing process per unit of volume.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DepositionDensityTimeSeries' type='DepositionDensityTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The density of the material deposited in an additive
        manufacturing process per unit of volume.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionMassType'>
    <xs:annotation>
      <xs:documentation>
        The mass of the material deposited in an additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DepositionMass' type='DepositionMassType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The mass of the material deposited in an additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionMassTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The mass of the material deposited in an additive
        manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DepositionMassTimeSeries' type='DepositionMassTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The mass of the material deposited in an additive
        manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionRateVolumetricType'>
    <xs:annotation>
      <xs:documentation>
        The rate at which a spatial volume of material is deposited in an
        additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DepositionRateVolumetric' type='DepositionRateVolumetricType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The rate at which a spatial volume of material is deposited in an
        additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionRateVolumetricTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The rate at which a spatial volume of material is
        deposited in an additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DepositionRateVolumetricTimeSeries' type='DepositionRateVolumetricTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The rate at which a spatial volume of material is
        deposited in an additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionVolumeType'>
    <xs:annotation>
      <xs:documentation>
        The spatial volume of material to be deposited in an additive
        manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DepositionVolume' type='DepositionVolumeType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The spatial volume of material to be deposited in an additive
        manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionVolumeTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The spatial volume of material to be deposited in an
        additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DepositionVolumeTimeSeries' type='DepositionVolumeTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The spatial volume of material to be deposited in an
        additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DisplacementType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the change in position of an object.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Displacement' type='DisplacementType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the change in position of an object.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DisplacementTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the change in position of an object.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DisplacementTimeSeries' type='DisplacementTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the change in position of an object.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ElectricalEnergyType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of electrical energy consumption by a component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ElectricalEnergy' type='ElectricalEnergyType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of electrical energy consumption by a component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ElectricalEnergyTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of electrical energy consumption by a
        component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ElectricalEnergyTimeSeries' type='ElectricalEnergyTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of electrical energy consumption by a
        component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='EquipmentTimerType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the amount of time a piece of equipment or a sub-part
        of a piece of equipment has performed specific activities.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='EquipmentTimer' type='EquipmentTimerType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the amount of time a piece of equipment or a sub-part
        of a piece of equipment has performed specific activities.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='EquipmentTimerTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the amount of time a piece of
        equipment or a sub-part of a piece of equipment has performed specific
        activities.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='EquipmentTimerTimeSeries' type='EquipmentTimerTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the amount of time a piece of
        equipment or a sub-part of a piece of equipment has performed specific
        activities.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FillLevelType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the amount of a substance remaining compared to the
        planned maximum amount of that substance.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='FillLevel' type='FillLevelType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the amount of a substance remaining compared to the
        planned maximum amount of that substance.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FillLevelTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the amount of a substance remaining
        compared to the planned maximum amount of that substance.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='FillLevelTimeSeries' type='FillLevelTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the amount of a substance remaining
        compared to the planned maximum amount of that substance.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FlowType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the rate of flow of a fluid.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Flow' type='FlowType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the rate of flow of a fluid.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FlowTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the rate of flow of a fluid.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='FlowTimeSeries' type='FlowTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the rate of flow of a fluid.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FrequencyType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the number of occurrences of a repeating event per
        unit time.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Frequency' type='FrequencyType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the number of occurrences of a repeating event per
        unit time.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FrequencyTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the number of occurrences of a
        repeating event per unit time.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='FrequencyTimeSeries' type='FrequencyTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the number of occurrences of a
        repeating event per unit time.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='GlobalPositionType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in Version 1.1
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='GlobalPosition' type='GlobalPositionType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in Version 1.1
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='GlobalPositionTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of **DEPRECATED** in Version 1.1
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='GlobalPositionTimeSeries' type='GlobalPositionTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of **DEPRECATED** in Version 1.1
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LengthType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the length of an object.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Length' type='LengthType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the length of an object.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LengthTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the length of an object.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LengthTimeSeries' type='LengthTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the length of an object.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LevelType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.2*. See {{block(FillLevel)}}. Represents
        the level of a resource.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Level' type='LevelType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.2*. See {{block(FillLevel)}}. Represents
        the level of a resource.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LevelTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of **DEPRECATED** in *Version 1.2*. See
        {{block(FillLevel)}}. Represents the level of a resource.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LevelTimeSeries' type='LevelTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of **DEPRECATED** in *Version 1.2*. See
        {{block(FillLevel)}}. Represents the level of a resource.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LinearForceType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the push or pull introduced by an actuator or exerted
        on an object.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LinearForce' type='LinearForceType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the push or pull introduced by an actuator or exerted
        on an object.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LinearForceTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the push or pull introduced by an
        actuator or exerted on an object.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LinearForceTimeSeries' type='LinearForceTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the push or pull introduced by an
        actuator or exerted on an object.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LoadType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the actual versus the standard rating of a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Load' type='LoadType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the actual versus the standard rating of a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LoadTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the actual versus the standard rating
        of a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LoadTimeSeries' type='LoadTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the actual versus the standard rating
        of a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MassType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the mass of an object(s) or an amount of material.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Mass' type='MassType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the mass of an object(s) or an amount of material.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MassTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the mass of an object(s) or an amount
        of material.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='MassTimeSeries' type='MassTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the mass of an object(s) or an amount
        of material.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PathFeedrateType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the feedrate for the axes, or a single axis,
        associated with a {{block(Path)}} component-a vector.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PathFeedrate' type='PathFeedrateType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the feedrate for the axes, or a single axis,
        associated with a {{block(Path)}} component-a vector.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PathFeedrateTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the feedrate for the axes, or a single
        axis, associated with a {{block(Path)}} component-a vector.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PathFeedrateTimeSeries' type='PathFeedrateTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the feedrate for the axes, or a single
        axis, associated with a {{block(Path)}} component-a vector.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PathFeedratePerRevolutionType'>
    <xs:annotation>
      <xs:documentation>
        The feedrate for the axes, or a single axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PathFeedratePerRevolution' type='PathFeedratePerRevolutionType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The feedrate for the axes, or a single axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PathFeedratePerRevolutionTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The feedrate for the axes, or a single axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PathFeedratePerRevolutionTimeSeries' type='PathFeedratePerRevolutionTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The feedrate for the axes, or a single axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PathPositionType'>
    <xs:annotation>
      <xs:documentation>
        A measured or calculated position of a control point associated with a
        {{block(Controller)}} element, or {{block(Path)}} element if provided,
        of a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ThreeSpaceSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PathPosition' type='PathPositionType' substitutionGroup='ThreeSpaceSample'>
    <xs:annotation>
      <xs:documentation>
        A measured or calculated position of a control point associated with a
        {{block(Controller)}} element, or {{block(Path)}} element if provided,
        of a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PHType'>
    <xs:annotation>
      <xs:documentation>
        A measure of the acidity or alkalinity of a solution.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PH' type='PHType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        A measure of the acidity or alkalinity of a solution.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PHTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of A measure of the acidity or alkalinity of a solution.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PHTimeSeries' type='PHTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of A measure of the acidity or alkalinity of a solution.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PositionType'>
    <xs:annotation>
      <xs:documentation>
        A measured or calculated position of a {{block(Component)}} element as
        reported by a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Position' type='PositionType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        A measured or calculated position of a {{block(Component)}} element as
        reported by a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PositionTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of A measured or calculated position of a
        {{block(Component)}} element as reported by a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PositionTimeSeries' type='PositionTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of A measured or calculated position of a
        {{block(Component)}} element as reported by a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PowerFactorType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the ratio of real power flowing to a load to the
        apparent power in that AC circuit.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PowerFactor' type='PowerFactorType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the ratio of real power flowing to a load to the
        apparent power in that AC circuit.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PowerFactorTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the ratio of real power flowing to a
        load to the apparent power in that AC circuit.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PowerFactorTimeSeries' type='PowerFactorTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the ratio of real power flowing to a
        load to the apparent power in that AC circuit.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PressureType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Pressure)}} is a system that delivers compressed gas or fluid
        and controls the pressure and rate of pressure change to a desired
        target set-point. Note: For example, Delivery Method can be a Compressed
        Air or N2 tank that is piped via an inlet valve to the chamber.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Pressure' type='PressureType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        {{block(Pressure)}} is a system that delivers compressed gas or fluid
        and controls the pressure and rate of pressure change to a desired
        target set-point. Note: For example, Delivery Method can be a Compressed
        Air or N2 tank that is piped via an inlet valve to the chamber.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PressureTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The force per unit area measured relative to atmospheric
        pressure. Commonly referred to as gauge pressure.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PressureTimeSeries' type='PressureTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The force per unit area measured relative to atmospheric
        pressure. Commonly referred to as gauge pressure.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessTimerType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the amount of time a piece of equipment has performed
        different types of activities associated with the process being
        performed at that piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProcessTimer' type='ProcessTimerType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the amount of time a piece of equipment has performed
        different types of activities associated with the process being
        performed at that piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessTimerTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the amount of time a piece of
        equipment has performed different types of activities associated with
        the process being performed at that piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProcessTimerTimeSeries' type='ProcessTimerTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the amount of time a piece of
        equipment has performed different types of activities associated with
        the process being performed at that piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ResistanceType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the degree to which a substance opposes the passage
        of an electric current.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Resistance' type='ResistanceType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the degree to which a substance opposes the passage
        of an electric current.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ResistanceTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the degree to which a substance
        opposes the passage of an electric current.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ResistanceTimeSeries' type='ResistanceTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the degree to which a substance
        opposes the passage of an electric current.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='RotaryVelocityType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the rotational speed of a rotary axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='RotaryVelocity' type='RotaryVelocityType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the rotational speed of a rotary axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='RotaryVelocityTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the rotational speed of a rotary axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='RotaryVelocityTimeSeries' type='RotaryVelocityTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the rotational speed of a rotary axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SoundLevelType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of a sound level or sound pressure level relative to
        atmospheric pressure.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='SoundLevel' type='SoundLevelType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of a sound level or sound pressure level relative to
        atmospheric pressure.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SoundLevelTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of a sound level or sound pressure level
        relative to atmospheric pressure.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='SoundLevelTimeSeries' type='SoundLevelTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of a sound level or sound pressure level
        relative to atmospheric pressure.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SpindleSpeedType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.2*. Replaced by {{block(RotaryVelocity)}}.
        The rotational speed of the rotary axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='SpindleSpeed' type='SpindleSpeedType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.2*. Replaced by {{block(RotaryVelocity)}}.
        The rotational speed of the rotary axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SpindleSpeedTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of **DEPRECATED** in *Version 1.2*. Replaced by
        {{block(RotaryVelocity)}}. The rotational speed of the rotary axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='SpindleSpeedTimeSeries' type='SpindleSpeedTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of **DEPRECATED** in *Version 1.2*. Replaced by
        {{block(RotaryVelocity)}}. The rotational speed of the rotary axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='StrainType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the amount of deformation per unit length of an
        object when a load is applied.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Strain' type='StrainType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the amount of deformation per unit length of an
        object when a load is applied.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='StrainTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the amount of deformation per unit
        length of an object when a load is applied.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='StrainTimeSeries' type='StrainTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the amount of deformation per unit
        length of an object when a load is applied.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TemperatureType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of temperature.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Temperature' type='TemperatureType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of temperature.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TemperatureTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of temperature.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='TemperatureTimeSeries' type='TemperatureTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of temperature.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TensionType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of a force that stretches or elongates an object.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Tension' type='TensionType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of a force that stretches or elongates an object.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TensionTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of a force that stretches or elongates an
        object.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='TensionTimeSeries' type='TensionTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of a force that stretches or elongates an
        object.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TiltType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of angular displacement.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Tilt' type='TiltType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of angular displacement.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TiltTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of angular displacement.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='TiltTimeSeries' type='TiltTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of angular displacement.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TorqueType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the turning force exerted on an object or by an
        object.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Torque' type='TorqueType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the turning force exerted on an object or by an
        object.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TorqueTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the turning force exerted on an object
        or by an object.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='TorqueTimeSeries' type='TorqueTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the turning force exerted on an object
        or by an object.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VelocityType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the rate of change of position of a
        {{block(Component)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Velocity' type='VelocityType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the rate of change of position of a
        {{block(Component)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VelocityTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the rate of change of position of a
        {{block(Component)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VelocityTimeSeries' type='VelocityTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the rate of change of position of a
        {{block(Component)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ViscosityType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of a fluids resistance to flow.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Viscosity' type='ViscosityType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of a fluids resistance to flow.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ViscosityTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of a fluids resistance to flow.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ViscosityTimeSeries' type='ViscosityTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of a fluids resistance to flow.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VoltageType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.6*. Replaced by {{block(VoltageAC)}} and
        {{block(VoltageDC)}}. The measurement of electrical potential between
        two points.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Voltage' type='VoltageType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.6*. Replaced by {{block(VoltageAC)}} and
        {{block(VoltageDC)}}. The measurement of electrical potential between
        two points.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VoltageTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of **DEPRECATED** in *Version 1.6*. Replaced by
        {{block(VoltageAC)}} and {{block(VoltageDC)}}. The measurement of
        electrical potential between two points.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VoltageTimeSeries' type='VoltageTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of **DEPRECATED** in *Version 1.6*. Replaced by
        {{block(VoltageAC)}} and {{block(VoltageDC)}}. The measurement of
        electrical potential between two points.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VoltAmpereType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the apparent power in an electrical circuit, equal to
        the product of root-mean-square (RMS) voltage and RMS current (commonly
        referred to as VA).
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VoltAmpere' type='VoltAmpereType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the apparent power in an electrical circuit, equal to
        the product of root-mean-square (RMS) voltage and RMS current (commonly
        referred to as VA).
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VoltAmpereTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the apparent power in an electrical
        circuit, equal to the product of root-mean-square (RMS) voltage and RMS
        current (commonly referred to as VA).
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VoltAmpereTimeSeries' type='VoltAmpereTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the apparent power in an electrical
        circuit, equal to the product of root-mean-square (RMS) voltage and RMS
        current (commonly referred to as VA).
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VoltAmpereReactiveType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of reactive power in an AC electrical circuit (commonly
        referred to as VAR).
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VoltAmpereReactive' type='VoltAmpereReactiveType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of reactive power in an AC electrical circuit (commonly
        referred to as VAR).
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VoltAmpereReactiveTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of reactive power in an AC electrical
        circuit (commonly referred to as VAR).
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VoltAmpereReactiveTimeSeries' type='VoltAmpereReactiveTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of reactive power in an AC electrical
        circuit (commonly referred to as VAR).
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VolumeFluidType'>
    <xs:annotation>
      <xs:documentation>
        The fluid volume of an object or container.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VolumeFluid' type='VolumeFluidType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The fluid volume of an object or container.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VolumeFluidTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The fluid volume of an object or container.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VolumeFluidTimeSeries' type='VolumeFluidTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The fluid volume of an object or container.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VolumeSpatialType'>
    <xs:annotation>
      <xs:documentation>
        The geometric volume of an object or container.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VolumeSpatial' type='VolumeSpatialType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The geometric volume of an object or container.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VolumeSpatialTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The geometric volume of an object or container.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VolumeSpatialTimeSeries' type='VolumeSpatialTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The geometric volume of an object or container.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WattageType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of power flowing through or dissipated by an electrical
        circuit or piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Wattage' type='WattageType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of power flowing through or dissipated by an electrical
        circuit or piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WattageTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of power flowing through or dissipated by
        an electrical circuit or piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='WattageTimeSeries' type='WattageTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of power flowing through or dissipated by
        an electrical circuit or piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AmperageDCType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of an electric current flowing in one direction only.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AmperageDC' type='AmperageDCType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of an electric current flowing in one direction only.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AmperageDCTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of an electric current flowing in one
        direction only.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AmperageDCTimeSeries' type='AmperageDCTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of an electric current flowing in one
        direction only.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AmperageACType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of an electrical current that reverses direction at
        regular short intervals.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AmperageAC' type='AmperageACType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of an electrical current that reverses direction at
        regular short intervals.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AmperageACTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of an electrical current that reverses
        direction at regular short intervals.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AmperageACTimeSeries' type='AmperageACTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of an electrical current that reverses
        direction at regular short intervals.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VoltageACType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the electrical potential between two points in an
        electrical circuit in which the current periodically reverses direction.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VoltageAC' type='VoltageACType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the electrical potential between two points in an
        electrical circuit in which the current periodically reverses direction.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VoltageACTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the electrical potential between two
        points in an electrical circuit in which the current periodically
        reverses direction.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VoltageACTimeSeries' type='VoltageACTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the electrical potential between two
        points in an electrical circuit in which the current periodically
        reverses direction.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VoltageDCType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the electrical potential between two points in an
        electrical circuit in which the current is unidirectional.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VoltageDC' type='VoltageDCType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the electrical potential between two points in an
        electrical circuit in which the current is unidirectional.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VoltageDCTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the electrical potential between two
        points in an electrical circuit in which the current is unidirectional.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VoltageDCTimeSeries' type='VoltageDCTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measurement of the electrical potential between two
        points in an electrical circuit in which the current is unidirectional.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='XDimensionType'>
    <xs:annotation>
      <xs:documentation>
        Measured dimension of an entity relative to the X direction of the
        referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='XDimension' type='XDimensionType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        Measured dimension of an entity relative to the X direction of the
        referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='XDimensionTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of Measured dimension of an entity relative to the X
        direction of the referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='XDimensionTimeSeries' type='XDimensionTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of Measured dimension of an entity relative to the X
        direction of the referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='YDimensionType'>
    <xs:annotation>
      <xs:documentation>
        Measured dimension of an entity relative to the Y direction of the
        referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='YDimension' type='YDimensionType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        Measured dimension of an entity relative to the Y direction of the
        referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='YDimensionTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of Measured dimension of an entity relative to the Y
        direction of the referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='YDimensionTimeSeries' type='YDimensionTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of Measured dimension of an entity relative to the Y
        direction of the referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ZDimensionType'>
    <xs:annotation>
      <xs:documentation>
        Measured dimension of an entity relative to the Z direction of the
        referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ZDimension' type='ZDimensionType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        Measured dimension of an entity relative to the Z direction of the
        referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ZDimensionTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of Measured dimension of an entity relative to the Z
        direction of the referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ZDimensionTimeSeries' type='ZDimensionTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of Measured dimension of an entity relative to the Z
        direction of the referenced coordinate system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DiameterType'>
    <xs:annotation>
      <xs:documentation>
        The measured dimension of a diameter.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Diameter' type='DiameterType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The measured dimension of a diameter.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DiameterTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measured dimension of a diameter.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DiameterTimeSeries' type='DiameterTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The measured dimension of a diameter.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='OrientationType'>
    <xs:annotation>
      <xs:documentation>
        A measured or calculated orientation of a plane or vector relative to a
        cartesian coordinate system.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ThreeSpaceSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Orientation' type='OrientationType' substitutionGroup='ThreeSpaceSample'>
    <xs:annotation>
      <xs:documentation>
        A measured or calculated orientation of a plane or vector relative to a
        cartesian coordinate system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HumidityRelativeType'>
    <xs:annotation>
      <xs:documentation>
        The amount of water vapor present expressed as a percent to reach
        saturation at the same temperature.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='HumidityRelative' type='HumidityRelativeType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The amount of water vapor present expressed as a percent to reach
        saturation at the same temperature.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HumidityRelativeTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The amount of water vapor present expressed as a percent
        to reach saturation at the same temperature.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='HumidityRelativeTimeSeries' type='HumidityRelativeTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The amount of water vapor present expressed as a percent
        to reach saturation at the same temperature.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HumidityAbsoluteType'>
    <xs:annotation>
      <xs:documentation>
        The amount of water vapor expressed in grams per cubic meter.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='HumidityAbsolute' type='HumidityAbsoluteType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The amount of water vapor expressed in grams per cubic meter.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HumidityAbsoluteTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The amount of water vapor expressed in grams per cubic
        meter.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='HumidityAbsoluteTimeSeries' type='HumidityAbsoluteTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The amount of water vapor expressed in grams per cubic
        meter.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HumiditySpecificType'>
    <xs:annotation>
      <xs:documentation>
        The ratio of the water vapor present over the total weight of the water
        vapor and air present expressed as a percent. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='HumiditySpecific' type='HumiditySpecificType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The ratio of the water vapor present over the total weight of the water
        vapor and air present expressed as a percent. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HumiditySpecificTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The ratio of the water vapor present over the total
        weight of the water vapor and air present expressed as a percent. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='HumiditySpecificTimeSeries' type='HumiditySpecificTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The ratio of the water vapor present over the total
        weight of the water vapor and air present expressed as a percent. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PressurizationRateType'>
    <xs:annotation>
      <xs:documentation>
        The change of pressure per unit time.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PressurizationRate' type='PressurizationRateType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The change of pressure per unit time.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PressurizationRateTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The change of pressure per unit time.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PressurizationRateTimeSeries' type='PressurizationRateTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The change of pressure per unit time.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DecelerationType'>
    <xs:annotation>
      <xs:documentation>
        Negative rate of change of velocity.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Deceleration' type='DecelerationType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        Negative rate of change of velocity.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DecelerationTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of Negative rate of change of velocity.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DecelerationTimeSeries' type='DecelerationTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of Negative rate of change of velocity.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AssetUpdateRateType'>
    <xs:annotation>
      <xs:documentation>
        The average rate of change of values for assets in the MTConnect
        streams. The average is computed over a rolling window defined by the
        implementation.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AssetUpdateRate' type='AssetUpdateRateType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The average rate of change of values for assets in the MTConnect
        streams. The average is computed over a rolling window defined by the
        implementation.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AssetUpdateRateTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The average rate of change of values for assets in the
        MTConnect streams. The average is computed over a rolling window defined
        by the implementation.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AssetUpdateRateTimeSeries' type='AssetUpdateRateTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The average rate of change of values for assets in the
        MTConnect streams. The average is computed over a rolling window defined
        by the implementation.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AngularDecelerationType'>
    <xs:annotation>
      <xs:documentation>
        Negative rate of change of angular velocity.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AngularDeceleration' type='AngularDecelerationType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        Negative rate of change of angular velocity.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AngularDecelerationTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of Negative rate of change of angular velocity.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AngularDecelerationTimeSeries' type='AngularDecelerationTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of Negative rate of change of angular velocity.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ObservationUpdateRateType'>
    <xs:annotation>
      <xs:documentation>
        The average rate of change of values for data items in the MTConnect
        streams. The average is computed over a rolling window defined by the
        implementation.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ObservationUpdateRate' type='ObservationUpdateRateType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The average rate of change of values for data items in the MTConnect
        streams. The average is computed over a rolling window defined by the
        implementation.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ObservationUpdateRateTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The average rate of change of values for data items in
        the MTConnect streams. The average is computed over a rolling window
        defined by the implementation.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ObservationUpdateRateTimeSeries' type='ObservationUpdateRateTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The average rate of change of values for data items in
        the MTConnect streams. The average is computed over a rolling window
        defined by the implementation.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PressureAbsoluteType'>
    <xs:annotation>
      <xs:documentation>
        The force per unit area measured relative to a vacuum.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='CommonSampleType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PressureAbsolute' type='PressureAbsoluteType' substitutionGroup='CommonSample'>
    <xs:annotation>
      <xs:documentation>
        The force per unit area measured relative to a vacuum.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PressureAbsoluteTimeSeriesType'>
    <xs:annotation>
      <xs:documentation>
        Time series of The force per unit area measured relative to a vacuum.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='TimeSeriesType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PressureAbsoluteTimeSeries' type='PressureAbsoluteTimeSeriesType' substitutionGroup='TimeSeries'>
    <xs:annotation>
      <xs:documentation>
        Time series of The force per unit area measured relative to a vacuum.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='IntegerEventValueType'>
    <xs:annotation>
      <xs:documentation>
        Integer event value
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='xs:integer UnavailableValueType'/>
  </xs:simpleType>
  <xs:simpleType name='FloatEventValueType'>
    <xs:annotation>
      <xs:documentation>
        Integer event value
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='xs:float UnavailableValueType'/>
  </xs:simpleType>
  <xs:simpleType name='StringEventValueType'>
    <xs:annotation>
      <xs:documentation>
        Srring event value
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='xs:string UnavailableValueType'/>
  </xs:simpleType>
  <xs:simpleType name='StringListValueType'>
    <xs:annotation>
      <xs:documentation>
        A list of axis names
      </xs:documentation>
    </xs:annotation>
    <xs:list>
      <xs:simpleType>
        <xs:restriction base='xs:string'/>
      </xs:simpleType>
    </xs:list>
  </xs:simpleType>
  <xs:simpleType name='StringListEventValueType'>
    <xs:annotation>
      <xs:documentation>
        A list of axis for an event
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='StringListValueType UnavailableValueType'/>
  </xs:simpleType>
  <xs:complexType name='EventType' abstract='true' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        Something that happens or takes place.
      </xs:documentation>
    </xs:annotation>
    <xs:attributeGroup ref='ObservationType'/>
    <xs:attribute name='resetTriggered' type='DataItemResetValueType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          An optional indicator that the event or sample was reset
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Event' type='EventType'>
    <xs:annotation>
      <xs:documentation>
        Something that happens or takes place.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='StringEventType'>
    <xs:annotation>
      <xs:documentation>
        An unfaceted string event
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='StringEventValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='StringEvent' type='StringEventType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An unfaceted string event
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='StringListEventType'>
    <xs:annotation>
      <xs:documentation>
        An unfaceted string event
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='StringListEventValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='StringListEvent' type='StringListEventType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An unfaceted string event
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='IntegerEventType'>
    <xs:annotation>
      <xs:documentation>
        An event with an integer value
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='IntegerEventValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='IntegerEvent' type='IntegerEventType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An event with an integer value
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FloatEventType'>
    <xs:annotation>
      <xs:documentation>
        An event with an integer value
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='FloatEventValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='FloatEvent' type='FloatEventType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An event with an integer value
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ActiveAxesType'>
    <xs:annotation>
      <xs:documentation>
        The result is a space delimited list of axes names.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringListEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ActiveAxes' type='ActiveAxesType' substitutionGroup='StringListEvent'>
    <xs:annotation>
      <xs:documentation>
        The result is a space delimited list of axes names.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ActuatorStateValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for ActuatorState
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} that is engaging.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} that is not engaging.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='ActuatorStateType'>
    <xs:annotation>
      <xs:documentation>
        Represents the operational state of an apparatus for moving or
        controlling a mechanism or system.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='ActuatorStateValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ActuatorState' type='ActuatorStateType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        Represents the operational state of an apparatus for moving or
        controlling a mechanism or system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AssetChangedType'>
    <xs:annotation>
      <xs:documentation>
        An {{term(MTConnect Asset)}} has been added or modified. The value
        **MUST** be the {{property(assetId)}} of the {{block(Asset)}} that has
        been modified.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'>
        <xs:attribute name='assetType' type='AssetAttrTypeType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The type of asset
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AssetChanged' type='AssetChangedType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An {{term(MTConnect Asset)}} has been added or modified. The value
        **MUST** be the {{property(assetId)}} of the {{block(Asset)}} that has
        been modified.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AssetRemovedType'>
    <xs:annotation>
      <xs:documentation>
        An {{term(MTConnect Asset)}} has been removed. The value **MUST** be the
        {{property(assetId)}} of the {{block(Asset)}} that has been removed.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'>
        <xs:attribute name='assetType' type='AssetAttrTypeType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The type of asset
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AssetRemoved' type='AssetRemovedType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An {{term(MTConnect Asset)}} has been removed. The value **MUST** be the
        {{property(assetId)}} of the {{block(Asset)}} that has been removed.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='AvailabilityValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for Availability
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='AVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            The value or status of an XML element when it is available.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} either when the data is not
            received or the entity is incapable of providing data.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='AvailabilityType'>
    <xs:annotation>
      <xs:documentation>
        Represents the {{term(Agent)}}&apos;s ability to communicate with the
        data source.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='AvailabilityValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Availability' type='AvailabilityType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        Represents the {{term(Agent)}}&apos;s ability to communicate with the
        data source.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='AxisCouplingValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for AxisCoupling
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='TANDEM'>
        <xs:annotation>
          <xs:documentation>
            Elements are physically connected to each other and operate as a
            single unit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SYNCHRONOUS'>
        <xs:annotation>
          <xs:documentation>
            Physical or logical parts which are not physically connected to each
            other but are operating together.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MASTER'>
        <xs:annotation>
          <xs:documentation>
            It provides information or state values that influences the
            operation of other {{block(DataItem)}} of similar type.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SLAVE'>
        <xs:annotation>
          <xs:documentation>
            The axis is a slave to the {{block(COUPLED_AXES)}}
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='AxisCouplingType'>
    <xs:annotation>
      <xs:documentation>
        Describes the way the axes will be associated to each other. This is
        used in conjunction with {{block(CoupledAxis)}} to indicate the way they
        are interacting.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='AxisCouplingValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AxisCoupling' type='AxisCouplingType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        Describes the way the axes will be associated to each other. This is
        used in conjunction with {{block(CoupledAxis)}} to indicate the way they
        are interacting.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AxisFeedrateOverrideType'>
    <xs:annotation>
      <xs:documentation>
        The value of a signal or calculation issued to adjust the feedrate of an
        individual linear type axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='FloatEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AxisFeedrateOverride' type='AxisFeedrateOverrideType' substitutionGroup='FloatEvent'>
    <xs:annotation>
      <xs:documentation>
        The value of a signal or calculation issued to adjust the feedrate of an
        individual linear type axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='AxisInterlockValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for AxisInterlock
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} that is engaging.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} that is not engaging.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='AxisInterlockType'>
    <xs:annotation>
      <xs:documentation>
        An indicator of the state of the axis lockout function when power has
        been removed and the axis is allowed to move freely.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='AxisInterlockValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AxisInterlock' type='AxisInterlockType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indicator of the state of the axis lockout function when power has
        been removed and the axis is allowed to move freely.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='AxisStateValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for AxisState
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='HOME'>
        <xs:annotation>
          <xs:documentation>
            The component at its home position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TRAVEL'>
        <xs:annotation>
          <xs:documentation>
            The component is in motion.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PARKED'>
        <xs:annotation>
          <xs:documentation>
            The component has been moved to a fixed position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STOPPED'>
        <xs:annotation>
          <xs:documentation>
            The component is stopped.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='AxisStateType'>
    <xs:annotation>
      <xs:documentation>
        An indicator of the controlled state of a {{block(Linear)}} or
        {{block(Rotary)}} component representing an axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='AxisStateValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AxisState' type='AxisStateType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indicator of the controlled state of a {{block(Linear)}} or
        {{block(Rotary)}} component representing an axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='BlockType'>
    <xs:annotation>
      <xs:documentation>
        The line of code or command being executed by a {{block(Controller)}}
        {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Block' type='BlockType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The line of code or command being executed by a {{block(Controller)}}
        {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='BlockCountType'>
    <xs:annotation>
      <xs:documentation>
        The total count of the number of blocks of program code that have been
        executed since execution started.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='IntegerEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='BlockCount' type='BlockCountType' substitutionGroup='IntegerEvent'>
    <xs:annotation>
      <xs:documentation>
        The total count of the number of blocks of program code that have been
        executed since execution started.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ChuckInterlockValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for ChuckInterlock
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} that is engaging.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} that is not engaging.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='ChuckInterlockType'>
    <xs:annotation>
      <xs:documentation>
        An indication of the operational condition of the interlock function for
        an electronically controller chuck.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='ChuckInterlockValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ChuckInterlock' type='ChuckInterlockType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indication of the operational condition of the interlock function for
        an electronically controller chuck.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ChuckStateValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for ChuckState
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='OPEN'>
        <xs:annotation>
          <xs:documentation>
            A component is open to the point of a positive confirmation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLOSED'>
        <xs:annotation>
          <xs:documentation>
            A component is closed to the point of a positive confirmation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNLATCHED'>
        <xs:annotation>
          <xs:documentation>
            An intermediate position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='ChuckStateType'>
    <xs:annotation>
      <xs:documentation>
        An indication of the operating state of a mechanism that holds a part or
        stock material during a manufacturing process. It may also represent a
        mechanism that holds any other mechanism in place within a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='ChuckStateValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ChuckState' type='ChuckStateType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indication of the operating state of a mechanism that holds a part or
        stock material during a manufacturing process. It may also represent a
        mechanism that holds any other mechanism in place within a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CloseChuckType'>
    <xs:annotation>
      <xs:documentation>
        Service to close a chuck.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CloseChuck' type='CloseChuckType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Service to close a chuck.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CloseDoorType'>
    <xs:annotation>
      <xs:documentation>
        Service to close a door.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CloseDoor' type='CloseDoorType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Service to close a door.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CodeType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.1*. The programmatic code being executed.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Code' type='CodeType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.1*. The programmatic code being executed.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CompositionStateType'>
    <xs:annotation>
      <xs:documentation>
        An indication of the operating condition of a mechanism represented by a
        {{block(Composition)}} type element.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CompositionState' type='CompositionStateType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An indication of the operating condition of a mechanism represented by a
        {{block(Composition)}} type element.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ControllerModeValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for ControllerMode
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='AUTOMATIC'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Controller)}} is configured to automatically execute a
            program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MANUAL'>
        <xs:annotation>
          <xs:documentation>
            Operations based on the instructions received from an external
            source.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MANUAL_DATA_INPUT'>
        <xs:annotation>
          <xs:documentation>
            The operator can enter a series of operations for the controller to
            perform.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SEMI_AUTOMATIC'>
        <xs:annotation>
          <xs:documentation>
            The controller executes a single set of instructions from an active
            program and then stops until given a command to execute the next set
            of instructions.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EDIT'>
        <xs:annotation>
          <xs:documentation>
            The controller is currently functioning as a programming device and
            is not capable of executing an active program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='ControllerModeType'>
    <xs:annotation>
      <xs:documentation>
        The current operating mode of the {{block(Controller)}} component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='ControllerModeValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ControllerMode' type='ControllerModeType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        The current operating mode of the {{block(Controller)}} component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ControllerModeOverrideValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for ControllerModeOverride
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ON'>
        <xs:annotation>
          <xs:documentation>
            On state or value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OFF'>
        <xs:annotation>
          <xs:documentation>
            Off state or value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='ControllerModeOverrideType'>
    <xs:annotation>
      <xs:documentation>
        A setting or operator selection that changes the behavior of a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='ControllerModeOverrideValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ControllerModeOverride' type='ControllerModeOverrideType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        A setting or operator selection that changes the behavior of a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CoupledAxesType'>
    <xs:annotation>
      <xs:documentation>
        Refers to the set of associated axes.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringListEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='CoupledAxes' type='CoupledAxesType' substitutionGroup='StringListEvent'>
    <xs:annotation>
      <xs:documentation>
        Refers to the set of associated axes.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DateCodeType'>
    <xs:annotation>
      <xs:documentation>
        The time and date code associated with a material or other physical
        item. {{block(DATE_CODE)}} **MUST** be reported in ISO 8601 format.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DateCode' type='DateCodeType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The time and date code associated with a material or other physical
        item. {{block(DATE_CODE)}} **MUST** be reported in ISO 8601 format.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DeviceUuidType'>
    <xs:annotation>
      <xs:documentation>
        The identifier of another piece of equipment that is temporarily
        associated with a component of this piece of equipment to perform a
        particular function. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DeviceUuid' type='DeviceUuidType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The identifier of another piece of equipment that is temporarily
        associated with a component of this piece of equipment to perform a
        particular function. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DirectionType'>
    <xs:annotation>
      <xs:documentation>
        An indication of a fault associated with the direction of motion of a
        {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Direction' type='DirectionType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An indication of a fault associated with the direction of motion of a
        {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='DoorStateValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for DoorState
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='OPEN'>
        <xs:annotation>
          <xs:documentation>
            A component is open to the point of a positive confirmation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLOSED'>
        <xs:annotation>
          <xs:documentation>
            A component is closed to the point of a positive confirmation.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNLATCHED'>
        <xs:annotation>
          <xs:documentation>
            An intermediate position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='DoorStateType'>
    <xs:annotation>
      <xs:documentation>
        The operational state of a {{block(Door)}} type component or composition
        element.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='DoorStateValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DoorState' type='DoorStateType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        The operational state of a {{block(Door)}} type component or composition
        element.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='EmergencyStopValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for EmergencyStop
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ARMED'>
        <xs:annotation>
          <xs:documentation>
            The emergency stop circuit is complete and the piece of equipment,
            component, or composition element is allowed to operate. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TRIGGERED'>
        <xs:annotation>
          <xs:documentation>
            The operation of the piece of equipment, component, or composition
            element is inhibited.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='EmergencyStopType'>
    <xs:annotation>
      <xs:documentation>
        The current state of the emergency stop signal for a piece of equipment,
        controller path, or any other component or subsystem of a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='EmergencyStopValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='EmergencyStop' type='EmergencyStopType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        The current state of the emergency stop signal for a piece of equipment,
        controller path, or any other component or subsystem of a piece of
        equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='EndOfBarValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for EndOfBar
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='YES'>
        <xs:annotation>
          <xs:documentation>
            The {{block(END_OF_BAR)}} has been reached.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NO'>
        <xs:annotation>
          <xs:documentation>
            The {{block(END_OF_BAR)}} has not been reached.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='EndOfBarType'>
    <xs:annotation>
      <xs:documentation>
        An indication that the end of a piece of bar stock has been reached.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='EndOfBarValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='EndOfBar' type='EndOfBarType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indication that the end of a piece of bar stock has been reached.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='EquipmentModeValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for EquipmentMode
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ON'>
        <xs:annotation>
          <xs:documentation>
            On state or value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OFF'>
        <xs:annotation>
          <xs:documentation>
            Off state or value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='EquipmentModeType'>
    <xs:annotation>
      <xs:documentation>
        An indication that a piece of equipment, or a sub-part of a piece of
        equipment, is performing specific types of activities.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='EquipmentModeValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='EquipmentMode' type='EquipmentModeType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indication that a piece of equipment, or a sub-part of a piece of
        equipment, is performing specific types of activities.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ExecutionValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for Execution
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='READY'>
        <xs:annotation>
          <xs:documentation>
            A component is ready to engage.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} that is engaging.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INTERRUPTED'>
        <xs:annotation>
          <xs:documentation>
            The action of a {{block(Component)}} has been suspended due to an
            external signal.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FEED_HOLD'>
        <xs:annotation>
          <xs:documentation>
            Motion of a {{block(Component)}} has been commanded to stop at its
            current position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STOPPED'>
        <xs:annotation>
          <xs:documentation>
            The component is stopped.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OPTIONAL_STOP'>
        <xs:annotation>
          <xs:documentation>
            The controllers program has been intentionally stopped
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_STOPPED'>
        <xs:annotation>
          <xs:documentation>
            The execution of the {{block(Controller)}}&apos;s program has been
            stopped by a command from within the program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROGRAM_COMPLETED'>
        <xs:annotation>
          <xs:documentation>
            The execution of the controllers program has been stopped by a
            command from within the program.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='ExecutionType'>
    <xs:annotation>
      <xs:documentation>
        The execution status of the {{block(Component)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='ExecutionValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Execution' type='ExecutionType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        The execution status of the {{block(Component)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='FunctionalModeValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for FunctionalMode
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='PRODUCTION'>
        <xs:annotation>
          <xs:documentation>
            A {{term(Structural Element)}} is currently producing product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SETUP'>
        <xs:annotation>
          <xs:documentation>
            A {{term(Structural Element)}} is being prepared or modified to
            begin production of product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TEARDOWN'>
        <xs:annotation>
          <xs:documentation>
            Typically, a {{term(Structural Element)}} has completed the
            production of a product and is being modified or returned to a
            neutral state such that it may then be prepared to begin production
            of a different product.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MAINTENANCE'>
        <xs:annotation>
          <xs:documentation>
            Action related to maintenance on the piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PROCESS_DEVELOPMENT'>
        <xs:annotation>
          <xs:documentation>
            A {{term(Structural Element)}} is being used to prove-out a new
            process.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='FunctionalModeType'>
    <xs:annotation>
      <xs:documentation>
        The current intended production status of the device or component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='FunctionalModeValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='FunctionalMode' type='FunctionalModeType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        The current intended production status of the device or component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HardnessType'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the hardness of a material.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='FloatEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Hardness' type='HardnessType' substitutionGroup='FloatEvent'>
    <xs:annotation>
      <xs:documentation>
        The measurement of the hardness of a material.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='InterfaceStateValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for InterfaceState
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ENABLED'>
        <xs:annotation>
          <xs:documentation>
            A component is currently operational and performing as expected.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DISABLED'>
        <xs:annotation>
          <xs:documentation>
            A component is currently not operational.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='InterfaceStateType'>
    <xs:annotation>
      <xs:documentation>
        An indication of the operation condition of an {{block(Interface)}}
        component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='InterfaceStateValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='InterfaceState' type='InterfaceStateType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indication of the operation condition of an {{block(Interface)}}
        component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LineType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.4.0*. The current line of code being
        executed.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Line' type='LineType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.4.0*. The current line of code being
        executed.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LineLabelType'>
    <xs:annotation>
      <xs:documentation>
        An optional identifier for a {{block(Block)}} of code in a
        {{block(Program)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LineLabel' type='LineLabelType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An optional identifier for a {{block(Block)}} of code in a
        {{block(Program)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LineNumberType'>
    <xs:annotation>
      <xs:documentation>
        A reference to the position of a block of program code within a control
        program.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='IntegerEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LineNumber' type='LineNumberType' substitutionGroup='IntegerEvent'>
    <xs:annotation>
      <xs:documentation>
        A reference to the position of a block of program code within a control
        program.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaterialType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Materials)}} provides information about materials or other items
        consumed or used by the piece of equipment for production of parts,
        materials, or other types of goods.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Material' type='MaterialType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Materials)}} provides information about materials or other items
        consumed or used by the piece of equipment for production of parts,
        materials, or other types of goods.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaterialChangeType'>
    <xs:annotation>
      <xs:documentation>
        Service to change the type of material or product being loaded or fed to
        a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='MaterialChange' type='MaterialChangeType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Service to change the type of material or product being loaded or fed to
        a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaterialFeedType'>
    <xs:annotation>
      <xs:documentation>
        Service to advance material or feed product to a piece of equipment from
        a continuous or bulk source.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='MaterialFeed' type='MaterialFeedType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Service to advance material or feed product to a piece of equipment from
        a continuous or bulk source.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaterialLayerType'>
    <xs:annotation>
      <xs:documentation>
        Identifies the layers of material applied to a part or product as part
        of an additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='IntegerEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='MaterialLayer' type='MaterialLayerType' substitutionGroup='IntegerEvent'>
    <xs:annotation>
      <xs:documentation>
        Identifies the layers of material applied to a part or product as part
        of an additive manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaterialLoadType'>
    <xs:annotation>
      <xs:documentation>
        Service to load a piece of material or product.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='MaterialLoad' type='MaterialLoadType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Service to load a piece of material or product.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaterialRetractType'>
    <xs:annotation>
      <xs:documentation>
        Service to remove or retract material or product.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='MaterialRetract' type='MaterialRetractType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Service to remove or retract material or product.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaterialUnloadType'>
    <xs:annotation>
      <xs:documentation>
        Service to unload a piece of material or product.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='MaterialUnload' type='MaterialUnloadType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Service to unload a piece of material or product.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MessageType'>
    <xs:annotation>
      <xs:documentation>
        A communication in writing, in speech, or by signals.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Message' type='MessageType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        A communication in writing, in speech, or by signals.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='OpenChuckType'>
    <xs:annotation>
      <xs:documentation>
        Service to open a chuck.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='OpenChuck' type='OpenChuckType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Service to open a chuck.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='OpenDoorType'>
    <xs:annotation>
      <xs:documentation>
        Service to open a door.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='OpenDoor' type='OpenDoorType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Service to open a door.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='OperatorIdType'>
    <xs:annotation>
      <xs:documentation>
        The identifier of the person currently responsible for operating the
        piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='OperatorId' type='OperatorIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The identifier of the person currently responsible for operating the
        piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PalletIdType'>
    <xs:annotation>
      <xs:documentation>
        The identifier for a pallet.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PalletId' type='PalletIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The identifier for a pallet.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PartChangeType'>
    <xs:annotation>
      <xs:documentation>
        Service to change the part or product associated with a piece of
        equipment to a different part or product.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PartChange' type='PartChangeType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Service to change the part or product associated with a piece of
        equipment to a different part or product.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PartCountType'>
    <xs:annotation>
      <xs:documentation>
        The aggregate count of parts.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='FloatEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PartCount' type='PartCountType' substitutionGroup='FloatEvent'>
    <xs:annotation>
      <xs:documentation>
        The aggregate count of parts.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='PartDetectValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for PartDetect
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='PRESENT'>
        <xs:annotation>
          <xs:documentation>
            If a part or work piece has been detected or is present.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NOT_PRESENT'>
        <xs:annotation>
          <xs:documentation>
            If a part or work piece is not detected or is not present.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='PartDetectType'>
    <xs:annotation>
      <xs:documentation>
        An indication designating whether a part or work piece has been detected
        or is present. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='PartDetectValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PartDetect' type='PartDetectType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indication designating whether a part or work piece has been detected
        or is present. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PartIdType'>
    <xs:annotation>
      <xs:documentation>
        An identifier of a part in a manufacturing operation.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PartId' type='PartIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An identifier of a part in a manufacturing operation.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PartNumberType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.7*. {{block(PartNumber)}} is now a
        `subType` of {{block(PartKindId)}}. An identifier of a part or product
        moving through the manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PartNumber' type='PartNumberType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.7*. {{block(PartNumber)}} is now a
        `subType` of {{block(PartKindId)}}. An identifier of a part or product
        moving through the manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PathFeedrateOverrideType'>
    <xs:annotation>
      <xs:documentation>
        The value of a signal or calculation issued to adjust the feedrate for
        the axes associated with a {{block(Path)}} component that may represent
        a single axis or the coordinated movement of multiple axes.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='FloatEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PathFeedrateOverride' type='PathFeedrateOverrideType' substitutionGroup='FloatEvent'>
    <xs:annotation>
      <xs:documentation>
        The value of a signal or calculation issued to adjust the feedrate for
        the axes associated with a {{block(Path)}} component that may represent
        a single axis or the coordinated movement of multiple axes.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='PathModeValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for PathMode
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='INDEPENDENT'>
        <xs:annotation>
          <xs:documentation>
            The path is operating independently and without the influence of
            another path.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MASTER'>
        <xs:annotation>
          <xs:documentation>
            It provides information or state values that influences the
            operation of other {{block(DataItem)}} of similar type.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SYNCHRONOUS'>
        <xs:annotation>
          <xs:documentation>
            Physical or logical parts which are not physically connected to each
            other but are operating together.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MIRROR'>
        <xs:annotation>
          <xs:documentation>
            The axes associated with the path are mirroring the motion of the
            {{block(MASTER)}} path.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='PathModeType'>
    <xs:annotation>
      <xs:documentation>
        Describes the operational relationship between a {{block(Path)}}
        {{term(Structural Element)}} and another {{block(Path)}}
        {{term(Structural Element)}} for pieces of equipment comprised of
        multiple logical groupings of controlled axes or other logical
        operations.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='PathModeValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PathMode' type='PathModeType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        Describes the operational relationship between a {{block(Path)}}
        {{term(Structural Element)}} and another {{block(Path)}}
        {{term(Structural Element)}} for pieces of equipment comprised of
        multiple logical groupings of controlled axes or other logical
        operations.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='PowerStateValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for PowerState
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ON'>
        <xs:annotation>
          <xs:documentation>
            On state or value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OFF'>
        <xs:annotation>
          <xs:documentation>
            Off state or value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='PowerStateType'>
    <xs:annotation>
      <xs:documentation>
        The indication of the status of the source of energy for a
        {{term(Structural Element)}} to allow it to perform its intended
        function or the state of an enabling signal providing permission for the
        {{term(Structural Element)}} to perform its functions.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='PowerStateValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PowerState' type='PowerStateType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        The indication of the status of the source of energy for a
        {{term(Structural Element)}} to allow it to perform its intended
        function or the state of an enabling signal providing permission for the
        {{term(Structural Element)}} to perform its functions.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PowerStatusType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.1.0*. The `ON` or `OFF` status of the
        component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PowerStatus' type='PowerStatusType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.1.0*. The `ON` or `OFF` status of the
        component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessTimeType'>
    <xs:annotation>
      <xs:documentation>
        The time and date associated with an activity or event.
        {{block(ProcessTime)}} **MUST** be reported in ISO 8601 format.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProcessTime' type='ProcessTimeType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The time and date associated with an activity or event.
        {{block(ProcessTime)}} **MUST** be reported in ISO 8601 format.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProgramType'>
    <xs:annotation>
      <xs:documentation>
        The name of the logic or motion program being executed by the
        {{block(Controller)}} component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Program' type='ProgramType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The name of the logic or motion program being executed by the
        {{block(Controller)}} component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProgramCommentType'>
    <xs:annotation>
      <xs:documentation>
        A comment or non-executable statement in the control program.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProgramComment' type='ProgramCommentType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        A comment or non-executable statement in the control program.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ProgramEditValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for ProgramEdit
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} that is engaging.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='READY'>
        <xs:annotation>
          <xs:documentation>
            A component is ready to engage.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NOT_READY'>
        <xs:annotation>
          <xs:documentation>
            A component is not ready to engage.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='ProgramEditType'>
    <xs:annotation>
      <xs:documentation>
        An indication of the status of the {{block(Controller)}} components
        program editing mode. On many controls, a program can be edited while
        another program is currently being executed.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='ProgramEditValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProgramEdit' type='ProgramEditType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indication of the status of the {{block(Controller)}} components
        program editing mode. On many controls, a program can be edited while
        another program is currently being executed.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProgramEditNameType'>
    <xs:annotation>
      <xs:documentation>
        The name of the program being edited. This is used in conjunction with
        {{block(ProgramEdit)}} when in `ACTIVE` state. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProgramEditName' type='ProgramEditNameType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The name of the program being edited. This is used in conjunction with
        {{block(ProgramEdit)}} when in `ACTIVE` state. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProgramHeaderType'>
    <xs:annotation>
      <xs:documentation>
        The non-executable header section of the control program.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProgramHeader' type='ProgramHeaderType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The non-executable header section of the control program.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProgramLocationType'>
    <xs:annotation>
      <xs:documentation>
        The Uniform Resource Identifier (URI) for the source file associated
        with {{block(Program)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProgramLocation' type='ProgramLocationType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The Uniform Resource Identifier (URI) for the source file associated
        with {{block(Program)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProgramLocationTypeType'>
    <xs:annotation>
      <xs:documentation>
        Defines whether the logic or motion program defined by
        {{block(Program)}} is being executed from the local memory of the
        controller or from an outside source. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProgramLocationType' type='ProgramLocationTypeType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Defines whether the logic or motion program defined by
        {{block(Program)}} is being executed from the local memory of the
        controller or from an outside source. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProgramNestLevelType'>
    <xs:annotation>
      <xs:documentation>
        An indication of the nesting level within a control program that is
        associated with the code or instructions that is currently being
        executed. If an Initial Value is not defined, the nesting level
        associated with the highest or initial nesting level of the program
        **MUST** default to zero (0). 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='IntegerEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProgramNestLevel' type='ProgramNestLevelType' substitutionGroup='IntegerEvent'>
    <xs:annotation>
      <xs:documentation>
        An indication of the nesting level within a control program that is
        associated with the code or instructions that is currently being
        executed. If an Initial Value is not defined, the nesting level
        associated with the highest or initial nesting level of the program
        **MUST** default to zero (0). 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='RotaryModeValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for RotaryMode
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='SPINDLE'>
        <xs:annotation>
          <xs:documentation>
            The axis is functioning as a spindle.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INDEX'>
        <xs:annotation>
          <xs:documentation>
            The axis is configured to index.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTOUR'>
        <xs:annotation>
          <xs:documentation>
            The position of the axis is being interpolated.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='RotaryModeType'>
    <xs:annotation>
      <xs:documentation>
        The current operating mode for a {{block(Rotary)}} type axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='RotaryModeValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='RotaryMode' type='RotaryModeType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        The current operating mode for a {{block(Rotary)}} type axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='RotaryVelocityOverrideType'>
    <xs:annotation>
      <xs:documentation>
        The value of a command issued to adjust the programmed velocity for a
        {{block(Rotary)}} type axis. This command represents a percentage change
        to the velocity calculated by a logic or motion program or set by a
        switch for a {{block(Rotary)}} type axis.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='FloatEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='RotaryVelocityOverride' type='RotaryVelocityOverrideType' substitutionGroup='FloatEvent'>
    <xs:annotation>
      <xs:documentation>
        The value of a command issued to adjust the programmed velocity for a
        {{block(Rotary)}} type axis. This command represents a percentage change
        to the velocity calculated by a logic or motion program or set by a
        switch for a {{block(Rotary)}} type axis.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SerialNumberType'>
    <xs:annotation>
      <xs:documentation>
        The serial number associated with a {{block(Component)}},
        {{block(Asset)}}, or {{block(Device)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='SerialNumber' type='SerialNumberType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The serial number associated with a {{block(Component)}},
        {{block(Asset)}}, or {{block(Device)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='SpindleInterlockValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for SpindleInterlock
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} that is engaging.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The value of the {{term(Data Entity)}} that is not engaging.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='SpindleInterlockType'>
    <xs:annotation>
      <xs:documentation>
        An indication of the status of the spindle for a piece of equipment when
        power has been removed and it is free to rotate.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='SpindleInterlockValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='SpindleInterlock' type='SpindleInterlockType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indication of the status of the spindle for a piece of equipment when
        power has been removed and it is free to rotate.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolAssetIdType'>
    <xs:annotation>
      <xs:documentation>
        The identifier of an individual tool asset.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ToolAssetId' type='ToolAssetIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The identifier of an individual tool asset.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolGroupType'>
    <xs:annotation>
      <xs:documentation>
        An identifier for the tool group associated with a specific tool.
        Commonly used to designate spare tools.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ToolGroup' type='ToolGroupType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An identifier for the tool group associated with a specific tool.
        Commonly used to designate spare tools.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolIdType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.2.0*. See {{block(ToolAssetId)}}. The
        identifier of the tool currently in use for a given `Path`.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ToolId' type='ToolIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED** in *Version 1.2.0*. See {{block(ToolAssetId)}}. The
        identifier of the tool currently in use for a given `Path`.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolNumberType'>
    <xs:annotation>
      <xs:documentation>
        The identifier assigned by the {{block(Controller)}} component to a
        cutting tool when in use by a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ToolNumber' type='ToolNumberType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The identifier assigned by the {{block(Controller)}} component to a
        cutting tool when in use by a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolOffsetType'>
    <xs:annotation>
      <xs:documentation>
        A reference to the tool offset variables applied to the active cutting
        tool associated with a {{block(Path)}} in a {{block(Controller)}} type
        component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='FloatEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ToolOffset' type='ToolOffsetType' substitutionGroup='FloatEvent'>
    <xs:annotation>
      <xs:documentation>
        A reference to the tool offset variables applied to the active cutting
        tool associated with a {{block(Path)}} in a {{block(Controller)}} type
        component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='UserType'>
    <xs:annotation>
      <xs:documentation>
        The identifier of the person currently responsible for operating the
        piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='User' type='UserType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The identifier of the person currently responsible for operating the
        piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VariableType'>
    <xs:annotation>
      <xs:documentation>
        A data value whose meaning may change over time due to changes in the
        opertion of a piece of equipment or the process being executed on that
        piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Variable' type='VariableType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        A data value whose meaning may change over time due to changes in the
        opertion of a piece of equipment or the process being executed on that
        piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='WaitStateValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for WaitState
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='POWERING_UP'>
        <xs:annotation>
          <xs:documentation>
            An indication that execution is waiting while the equipment is
            powering up and is not currently available to begin producing parts
            or products.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWERING_DOWN'>
        <xs:annotation>
          <xs:documentation>
            An indication that the execution is waiting while the equipment is
            powering down but has not fully reached a stopped state.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_LOAD'>
        <xs:annotation>
          <xs:documentation>
            An indication that the execution is waiting while one or more
            discrete workpieces are being loaded.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PART_UNLOAD'>
        <xs:annotation>
          <xs:documentation>
            An indication that the execution is waiting while one or more
            discrete workpieces are being unloaded.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_LOAD'>
        <xs:annotation>
          <xs:documentation>
            An indication that the execution is waiting while a tool or tooling
            is being loaded.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL_UNLOAD'>
        <xs:annotation>
          <xs:documentation>
            An indication that the execution is waiting while a tool or tooling
            is being unloaded.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_LOAD'>
        <xs:annotation>
          <xs:documentation>
            An indication that the execution is waiting while material is being
            loaded.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL_UNLOAD'>
        <xs:annotation>
          <xs:documentation>
            An indication that the execution is waiting while material is being
            unloaded.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SECONDARY_PROCESS'>
        <xs:annotation>
          <xs:documentation>
            An indication that the execution is waiting while another process is
            completed before the execution can resume.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PAUSING'>
        <xs:annotation>
          <xs:documentation>
            An indication that the execution is waiting while the equipment is
            pausing but the piece of equipment has not yet reached a fully
            paused state.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RESUMING'>
        <xs:annotation>
          <xs:documentation>
            An indication that the execution is waiting while the equipment is
            resuming the production cycle but has not yet resumed execution.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='WaitStateType'>
    <xs:annotation>
      <xs:documentation>
        An indication of the reason that {{block(Execution)}} is reporting a
        value of `WAIT`.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='WaitStateValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='WaitState' type='WaitStateType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An indication of the reason that {{block(Execution)}} is reporting a
        value of `WAIT`.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WireType'>
    <xs:annotation>
      <xs:documentation>
        A string like piece or filament of relatively rigid or flexible material
        provided in a variety of diameters.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Wire' type='WireType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        A string like piece or filament of relatively rigid or flexible material
        provided in a variety of diameters.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WorkholdingIdType'>
    <xs:annotation>
      <xs:documentation>
        The identifier for the current workholding or part clamp in use by a
        piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='WorkholdingId' type='WorkholdingIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The identifier for the current workholding or part clamp in use by a
        piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WorkOffsetType'>
    <xs:annotation>
      <xs:documentation>
        A reference to the offset variables for a work piece or part associated
        with a {{block(Path)}} in a {{block(Controller)}} type component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='FloatEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='WorkOffset' type='WorkOffsetType' substitutionGroup='FloatEvent'>
    <xs:annotation>
      <xs:documentation>
        A reference to the offset variables for a work piece or part associated
        with a {{block(Path)}} in a {{block(Controller)}} type component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='OperatingSystemType'>
    <xs:annotation>
      <xs:documentation>
        The Operating System of a component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='OperatingSystem' type='OperatingSystemType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The Operating System of a component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FirmwareType'>
    <xs:annotation>
      <xs:documentation>
        The embedded software of a component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Firmware' type='FirmwareType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The embedded software of a component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ApplicationType'>
    <xs:annotation>
      <xs:documentation>
        Software or a program that is specific to the solution of an application
        problem. {{cite(ISO/IEC 20944-1:2013)}}
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Application' type='ApplicationType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Software or a program that is specific to the solution of an application
        problem. {{cite(ISO/IEC 20944-1:2013)}}
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LibraryType'>
    <xs:annotation>
      <xs:documentation>
        The software library on a component. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Library' type='LibraryType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The software library on a component. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HardwareType'>
    <xs:annotation>
      <xs:documentation>
        An indication of a fault associated with the hardware subsystem of the
        {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Hardware' type='HardwareType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An indication of a fault associated with the hardware subsystem of the
        {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='NetworkType'>
    <xs:annotation>
      <xs:documentation>
        Network details of a component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Network' type='NetworkType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Network details of a component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='RotationType'>
    <xs:annotation>
      <xs:documentation>
        A three space angular rotation relative to a coordinate system.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Rotation' type='RotationType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        A three space angular rotation relative to a coordinate system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TranslationType'>
    <xs:annotation>
      <xs:documentation>
        A three space linear translation relative to a coordinate system. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Translation' type='TranslationType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        A three space linear translation relative to a coordinate system. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessKindIdType'>
    <xs:annotation>
      <xs:documentation>
        Identifier given to link the individual occurrence to a class of
        processes or process definition. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProcessKindId' type='ProcessKindIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Identifier given to link the individual occurrence to a class of
        processes or process definition. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='PartStatusValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for PartStatus
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='PASS'>
        <xs:annotation>
          <xs:documentation>
            The part does conform to given requirements.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FAIL'>
        <xs:annotation>
          <xs:documentation>
            The part does not conform to some given requirements.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='PartStatusType'>
    <xs:annotation>
      <xs:documentation>
        State or condition of a part. If unique identifier is given, part status
        is for that individual. If group identifier is given without a unique
        identifier, then the status is assumed to be for the whole group.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='PartStatusValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PartStatus' type='PartStatusType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        State or condition of a part. If unique identifier is given, part status
        is for that individual. If group identifier is given without a unique
        identifier, then the status is assumed to be for the whole group.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AlarmLimitType'>
    <xs:annotation>
      <xs:documentation>
        A set of limits used to trigger warning or alarm indicators.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AlarmLimit' type='AlarmLimitType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        A set of limits used to trigger warning or alarm indicators.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessAggregateIdType'>
    <xs:annotation>
      <xs:documentation>
        Identifier given to link the individual occurrence to a group of related
        occurrences, such as a process step in a process plan.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProcessAggregateId' type='ProcessAggregateIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Identifier given to link the individual occurrence to a group of related
        occurrences, such as a process step in a process plan.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PartKindIdType'>
    <xs:annotation>
      <xs:documentation>
        Identifier given to link the individual occurrence to a class of parts,
        typically distinguished by a particular part design. If no
        {{property(subType)}} is specified, `UUID` is default. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PartKindId' type='PartKindIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Identifier given to link the individual occurrence to a class of parts,
        typically distinguished by a particular part design. If no
        {{property(subType)}} is specified, `UUID` is default. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AdapterURIType'>
    <xs:annotation>
      <xs:documentation>
        The {{term(URI)}} of the {{term(Adapter)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AdapterURI' type='AdapterURIType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The {{term(URI)}} of the {{term(Adapter)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DeviceRemovedType'>
    <xs:annotation>
      <xs:documentation>
        An {{block(Event)}} that provides the {{term(UUID)}} of a device removed
        from an {{term(MTConnect Agent)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DeviceRemoved' type='DeviceRemovedType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An {{block(Event)}} that provides the {{term(UUID)}} of a device removed
        from an {{term(MTConnect Agent)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DeviceChangedType'>
    <xs:annotation>
      <xs:documentation>
        An {{block(Event)}} that provides the {{term(UUID)}} of the device whose
        {{term(Metadata)}} has changed.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DeviceChanged' type='DeviceChangedType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An {{block(Event)}} that provides the {{term(UUID)}} of the device whose
        {{term(Metadata)}} has changed.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SpecificationLimitType'>
    <xs:annotation>
      <xs:documentation>
        A set of limits defining a range of values designating acceptable
        performance for a variable.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='SpecificationLimit' type='SpecificationLimitType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        A set of limits defining a range of values designating acceptable
        performance for a variable.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ConnectionStatusValueType'>
    <xs:annotation>
      <xs:documentation>
        Controlled vocabulary for ConnectionStatus
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='CLOSED'>
        <xs:annotation>
          <xs:documentation>
            represents no connection at all.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LISTEN'>
        <xs:annotation>
          <xs:documentation>
            represents the {{term(Agent)}} waiting for a connection request from
            an {{term(Adapter)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ESTABLISHED'>
        <xs:annotation>
          <xs:documentation>
            represents an open connection. The normal state for the data
            transfer phase of the connection.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            Value is indeterminate
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='ConnectionStatusType'>
    <xs:annotation>
      <xs:documentation>
        The status of the connection between an {{term(Adapter)}} and an
        {{term(Agent)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='ConnectionStatusValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ConnectionStatus' type='ConnectionStatusType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        The status of the connection between an {{term(Adapter)}} and an
        {{term(Agent)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AdapterSoftwareVersionType'>
    <xs:annotation>
      <xs:documentation>
        The originator’s software version of the {{term(Adapter)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='AdapterSoftwareVersion' type='AdapterSoftwareVersionType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The originator’s software version of the {{term(Adapter)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SensorAttachmentType'>
    <xs:annotation>
      <xs:documentation>
        The reference version of the MTConnect Standard supported by the
        {{term(Adapter)}} .
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='SensorAttachment' type='SensorAttachmentType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The reference version of the MTConnect Standard supported by the
        {{term(Adapter)}} .
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ControlLimitType'>
    <xs:annotation>
      <xs:documentation>
        A set of limits used to indicate whether a process variable is stable
        and in control.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ControlLimit' type='ControlLimitType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        A set of limits used to indicate whether a process variable is stable
        and in control.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DeviceAddedType'>
    <xs:annotation>
      <xs:documentation>
        An {{block(Event)}} that provides the {{term(UUID)}} of new device added
        to an {{term(MTConnect Agent)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='DeviceAdded' type='DeviceAddedType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An {{block(Event)}} that provides the {{term(UUID)}} of new device added
        to an {{term(MTConnect Agent)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MTConnectVersionType'>
    <xs:annotation>
      <xs:documentation>
        The reference version of the MTConnect Standard supported by the
        {{term(Adapter)}} .
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='MTConnectVersion' type='MTConnectVersionType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        The reference version of the MTConnect Standard supported by the
        {{term(Adapter)}} .
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessOccurrenceIdType'>
    <xs:annotation>
      <xs:documentation>
        An identifier of a process being executed by the device.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ProcessOccurrenceId' type='ProcessOccurrenceIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        An identifier of a process being executed by the device.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PartGroupIdType'>
    <xs:annotation>
      <xs:documentation>
        Identifier given to a collection of individual parts. If no
        {{property(subType)}} is specified, `UUID` is default.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PartGroupId' type='PartGroupIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Identifier given to a collection of individual parts. If no
        {{property(subType)}} is specified, `UUID` is default.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PartUniqueIdType'>
    <xs:annotation>
      <xs:documentation>
        Identifier given to a distinguishable, individual part. If no
        {{property(subType)}} is specified, `UUID` is default. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PartUniqueId' type='PartUniqueIdType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        Identifier given to a distinguishable, individual part. If no
        {{property(subType)}} is specified, `UUID` is default. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PartCountDiscreteType'>
    <xs:annotation>
      <xs:documentation>
        Discrete of The aggregate count of parts.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='PartCountType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PartCountDiscrete' type='PartCountDiscreteType' substitutionGroup='PartCount'>
    <xs:annotation>
      <xs:documentation>
        Discrete of The aggregate count of parts.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolIdDiscreteType'>
    <xs:annotation>
      <xs:documentation>
        Discrete of **DEPRECATED** in *Version 1.2.0*. See
        {{block(ToolAssetId)}}. The identifier of the tool currently in use for
        a given `Path`.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ToolIdType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ToolIdDiscrete' type='ToolIdDiscreteType' substitutionGroup='ToolId'>
    <xs:annotation>
      <xs:documentation>
        Discrete of **DEPRECATED** in *Version 1.2.0*. See
        {{block(ToolAssetId)}}. The identifier of the tool currently in use for
        a given `Path`.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolNumberDiscreteType'>
    <xs:annotation>
      <xs:documentation>
        Discrete of The identifier assigned by the {{block(Controller)}}
        component to a cutting tool when in use by a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ToolNumberType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ToolNumberDiscrete' type='ToolNumberDiscreteType' substitutionGroup='ToolNumber'>
    <xs:annotation>
      <xs:documentation>
        Discrete of The identifier assigned by the {{block(Controller)}}
        component to a cutting tool when in use by a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolAssetIdDiscreteType'>
    <xs:annotation>
      <xs:documentation>
        Discrete of The identifier of an individual tool asset.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ToolAssetIdType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ToolAssetIdDiscrete' type='ToolAssetIdDiscreteType' substitutionGroup='ToolAssetId'>
    <xs:annotation>
      <xs:documentation>
        Discrete of The identifier of an individual tool asset.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PalletIdDiscreteType'>
    <xs:annotation>
      <xs:documentation>
        Discrete of The identifier for a pallet.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='PalletIdType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='PalletIdDiscrete' type='PalletIdDiscreteType' substitutionGroup='PalletId'>
    <xs:annotation>
      <xs:documentation>
        Discrete of The identifier for a pallet.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MessageDiscreteType'>
    <xs:annotation>
      <xs:documentation>
        Discrete of A communication in writing, in speech, or by signals.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='MessageType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='MessageDiscrete' type='MessageDiscreteType' substitutionGroup='Message'>
    <xs:annotation>
      <xs:documentation>
        Discrete of A communication in writing, in speech, or by signals.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='BlockDiscreteType'>
    <xs:annotation>
      <xs:documentation>
        Discrete of The line of code or command being executed by a
        {{block(Controller)}} {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='BlockType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='BlockDiscrete' type='BlockDiscreteType' substitutionGroup='Block'>
    <xs:annotation>
      <xs:documentation>
        Discrete of The line of code or command being executed by a
        {{block(Controller)}} {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='EntryType' abstract='true' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        See {{sect(TableEntry)}} for details on `Entry` element for
        {{block(Table)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='key' type='KeyType' use='required'>
      <xs:annotation>
        <xs:documentation>
          the key
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='removed' type='RemovedType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          an indicatore that the entry has been removed
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Entry' type='EntryType'>
    <xs:annotation>
      <xs:documentation>
        See {{sect(TableEntry)}} for details on `Entry` element for
        {{block(Table)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VariableEntryType'>
    <xs:annotation>
      <xs:documentation>
        DataSet of A data value whose meaning may change over time due to
        changes in the opertion of a piece of equipment or the process being
        executed on that piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EntryType'>
        <xs:simpleType>
          <xs:restriction base='StringEventValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='VariableEntry' type='VariableEntryType' substitutionGroup='Entry'>
    <xs:annotation>
      <xs:documentation>
        DataSet of A data value whose meaning may change over time due to
        changes in the opertion of a piece of equipment or the process being
        executed on that piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VariableDataSetType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        DataSet of A data value whose meaning may change over time due to
        changes in the opertion of a piece of equipment or the process being
        executed on that piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EventType'>
        <xs:sequence>
          <xs:element name='Entry' type='VariableEntryType' minOccurs='0' maxOccurs='unbounded'>
            <xs:annotation>
              <xs:documentation>
                See {{sect(TableEntry)}} for details on `Entry` element for
                {{block(Table)}}.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
        <xs:attribute name='count' type='CountValueType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The number of entries
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='VariableDataSet' type='VariableDataSetType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        DataSet of A data value whose meaning may change over time due to
        changes in the opertion of a piece of equipment or the process being
        executed on that piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TableCellType' abstract='true' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        A cell of a table
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='key' type='KeyType' use='required'>
      <xs:annotation>
        <xs:documentation>
          the key
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='TableCell' type='TableCellType'>
    <xs:annotation>
      <xs:documentation>
        A cell of a table
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TableEntryType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        A {{term(key-value pair)}} published as part of a {{term(Table)}}
        {{term(observation)}}. Note: Represented as {{block(Entry)}} in XML.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EntryType'>
        <xs:sequence>
          <xs:element ref='TableCell' minOccurs='0' maxOccurs='unbounded'/>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='TableEntry' type='TableEntryType' substitutionGroup='Entry'>
    <xs:annotation>
      <xs:documentation>
        A {{term(key-value pair)}} published as part of a {{term(Table)}}
        {{term(observation)}}. Note: Represented as {{block(Entry)}} in XML.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WorkOffsetTableEntryType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        Table Entry of A reference to the offset variables for a work piece or
        part associated with a {{block(Path)}} in a {{block(Controller)}} type
        component.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EntryType'>
        <xs:sequence>
          <xs:element name='Cell' type='WorkOffsetCellType' minOccurs='0' maxOccurs='unbounded'>
            <xs:annotation>
              <xs:documentation>
                Constraints for Cell Values
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='WorkOffsetTableEntry' type='WorkOffsetTableEntryType' substitutionGroup='Entry'>
    <xs:annotation>
      <xs:documentation>
        Table Entry of A reference to the offset variables for a work piece or
        part associated with a {{block(Path)}} in a {{block(Controller)}} type
        component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WorkOffsetCellType'>
    <xs:annotation>
      <xs:documentation>
        Cell of A reference to the offset variables for a work piece or part
        associated with a {{block(Path)}} in a {{block(Controller)}} type
        component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='TableCellType'>
        <xs:simpleType>
          <xs:restriction base='StringEventValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='WorkOffsetCell' type='WorkOffsetCellType' substitutionGroup='TableCell'>
    <xs:annotation>
      <xs:documentation>
        Cell of A reference to the offset variables for a work piece or part
        associated with a {{block(Path)}} in a {{block(Controller)}} type
        component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WorkOffsetTableType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        Table of A reference to the offset variables for a work piece or part
        associated with a {{block(Path)}} in a {{block(Controller)}} type
        component.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EventType'>
        <xs:sequence>
          <xs:element name='Entry' type='WorkOffsetTableEntryType' minOccurs='0' maxOccurs='unbounded'>
            <xs:annotation>
              <xs:documentation>
                See {{sect(TableEntry)}} for details on `Entry` element for
                {{block(Table)}}.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
        <xs:attribute name='count' type='CountValueType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The number of entries
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='WorkOffsetTable' type='WorkOffsetTableType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        Table of A reference to the offset variables for a work piece or part
        associated with a {{block(Path)}} in a {{block(Controller)}} type
        component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolOffsetTableEntryType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        Table Entry of A reference to the tool offset variables applied to the
        active cutting tool associated with a {{block(Path)}} in a
        {{block(Controller)}} type component.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EntryType'>
        <xs:sequence>
          <xs:element name='Cell' type='ToolOffsetCellType' minOccurs='0' maxOccurs='unbounded'>
            <xs:annotation>
              <xs:documentation>
                Constraints for Cell Values
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ToolOffsetTableEntry' type='ToolOffsetTableEntryType' substitutionGroup='Entry'>
    <xs:annotation>
      <xs:documentation>
        Table Entry of A reference to the tool offset variables applied to the
        active cutting tool associated with a {{block(Path)}} in a
        {{block(Controller)}} type component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolOffsetCellType'>
    <xs:annotation>
      <xs:documentation>
        Cell of A reference to the tool offset variables applied to the active
        cutting tool associated with a {{block(Path)}} in a
        {{block(Controller)}} type component.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='TableCellType'>
        <xs:simpleType>
          <xs:restriction base='StringEventValueType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='ToolOffsetCell' type='ToolOffsetCellType' substitutionGroup='TableCell'>
    <xs:annotation>
      <xs:documentation>
        Cell of A reference to the tool offset variables applied to the active
        cutting tool associated with a {{block(Path)}} in a
        {{block(Controller)}} type component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolOffsetTableType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        Table of A reference to the tool offset variables applied to the active
        cutting tool associated with a {{block(Path)}} in a
        {{block(Controller)}} type component.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EventType'>
        <xs:sequence>
          <xs:element name='Entry' type='ToolOffsetTableEntryType' minOccurs='0' maxOccurs='unbounded'>
            <xs:annotation>
              <xs:documentation>
                See {{sect(TableEntry)}} for details on `Entry` element for
                {{block(Table)}}.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
        <xs:attribute name='count' type='CountValueType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The number of entries
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ToolOffsetTable' type='ToolOffsetTableType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        Table of A reference to the tool offset variables applied to the active
        cutting tool associated with a {{block(Path)}} in a
        {{block(Controller)}} type component.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ConditionDescriptionType'>
    <xs:annotation>
      <xs:documentation>
        The description of the Condition
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='NativeSeverityType'>
    <xs:annotation>
      <xs:documentation>
        The device&apos;s severity
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='QualifierType'>
    <xs:annotation>
      <xs:documentation>
        A qualifier for the condition
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='HIGH'>
        <xs:annotation>
          <xs:documentation>
            The value is too high
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LOW'>
        <xs:annotation>
          <xs:documentation>
            The value is too low
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='ConditionType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        An indicator of the ability of a piece of equipment or
        {{term(Component)}} to function to specification.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConditionDescriptionType'>
        <xs:attributeGroup ref='ObservationType'/>
        <xs:attribute name='type' type='DataItemEnumType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The type of either a {{term(Structural Element)}} or a
              {{block(DataItem)}} being measured.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='nativeCode' type='NativeCodeType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The component specific Notifcation code
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='nativeSeverity' type='NativeSeverityType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The component specific Notifcation code
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='qualifier' type='QualifierType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              An optional attribute that helps qualify the condition
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='statistic' type='DataItemStatisticsType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The statistical operation on this data
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element abstract='true' name='Condition' type='ConditionType'>
    <xs:annotation>
      <xs:documentation>
        An indicator of the ability of a piece of equipment or
        {{term(Component)}} to function to specification.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='UnavailableType'>
    <xs:annotation>
      <xs:documentation>
        The conditon can not be determined.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConditionType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Unavailable' type='UnavailableType' substitutionGroup='Condition'>
    <xs:annotation>
      <xs:documentation>
        The conditon can not be determined.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='NormalType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Normal)}} indicates whether the value of the data is within an
        expected range.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConditionType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Normal' type='NormalType' substitutionGroup='Condition'>
    <xs:annotation>
      <xs:documentation>
        {{block(Normal)}} indicates whether the value of the data is within an
        expected range.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WarningType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Warning)}} indicates a possible unexpected situation because the
        value is unexpected or out of tolerance for the data.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConditionType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Warning' type='WarningType' substitutionGroup='Condition'>
    <xs:annotation>
      <xs:documentation>
        {{block(Warning)}} indicates a possible unexpected situation because the
        value is unexpected or out of tolerance for the data.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FaultType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Fault)}} indicates an unexpected situation because the value is
        unexpected or out of tolerance for the data.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConditionType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Fault' type='FaultType' substitutionGroup='Condition'>
    <xs:annotation>
      <xs:documentation>
        {{block(Fault)}} indicates an unexpected situation because the value is
        unexpected or out of tolerance for the data.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='NativeNotifcationCodeType'>
    <xs:annotation>
      <xs:documentation>
        DEPRECATED: An Notifcation code as defined by the component
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='NotifcationCodeType'>
    <xs:annotation>
      <xs:documentation>
        DEPRECATED: Types of Notifcations
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='FAILURE'>
        <xs:annotation>
          <xs:documentation>
            A failure
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FAULT'>
        <xs:annotation>
          <xs:documentation>
            A fault occurred
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CRASH'>
        <xs:annotation>
          <xs:documentation>
            A spindle crash
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='JAM'>
        <xs:annotation>
          <xs:documentation>
            A component has jammed
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OVERLOAD'>
        <xs:annotation>
          <xs:documentation>
            The component has been overloaded
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ESTOP'>
        <xs:annotation>
          <xs:documentation>
            E-Stop was pushed
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MATERIAL'>
        <xs:annotation>
          <xs:documentation>
            A material failure has occurred
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MESSAGE'>
        <xs:annotation>
          <xs:documentation>
            An operators message. Used with INFO severity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OTHER'>
        <xs:annotation>
          <xs:documentation>
            Another Notifcation type
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='AlarmStateType'>
    <xs:annotation>
      <xs:documentation>
        DEPRECATED: The active or cleared state of the notification
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The notification is active
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLEARED'>
        <xs:annotation>
          <xs:documentation>
            The notification has been cleared
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='SeverityType'>
    <xs:annotation>
      <xs:documentation>
        DEPRECATED: The severity of the notification
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='CRITICAL'>
        <xs:annotation>
          <xs:documentation>
            The notification is critical
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ERROR'>
        <xs:annotation>
          <xs:documentation>
            An error has occurred
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WARNING'>
        <xs:annotation>
          <xs:documentation>
            A medium level notification that should be observed
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='INFORMATION'>
        <xs:annotation>
          <xs:documentation>
            This notification is for information purposes only
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='AlarmType'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED:** Replaced with {{block(CONDITION)}} category data items
        in Version 1.1.0.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='StringEventType'>
        <xs:attribute name='code' type='NotifcationCodeType' use='required'>
          <xs:annotation>
            <xs:documentation>
              **DEPRECATED** in *Version 1.1*. The programmatic code being
              executed.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='severity' type='SeverityType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The severity
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='state' type='AlarmStateType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The state
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='nativeCode' type='NativeNotifcationCodeType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The component specific Notifcation code
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Alarm' type='AlarmType' substitutionGroup='StringEvent'>
    <xs:annotation>
      <xs:documentation>
        **DEPRECATED:** Replaced with {{block(CONDITION)}} category data items
        in Version 1.1.0.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='InterfaceEventValuesType'>
    <xs:annotation>
      <xs:documentation>
        The possible values for an interface event
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            The value is unavailable
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NOT_READY'>
        <xs:annotation>
          <xs:documentation>
            The interface is not ready
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='READY'>
        <xs:annotation>
          <xs:documentation>
            The interface is ready
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACTIVE'>
        <xs:annotation>
          <xs:documentation>
            The interface is actively executing
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMPLETE'>
        <xs:annotation>
          <xs:documentation>
            The interface has completed the action
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FAIL'>
        <xs:annotation>
          <xs:documentation>
            The interface action has failed
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='InterfaceEventType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        An abstract interface event
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:restriction base='EventType'>
        <xs:simpleType>
          <xs:restriction base='InterfaceEventValuesType'/>
        </xs:simpleType>
      </xs:restriction>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element abstract='true' name='InterfaceEvent' type='InterfaceEventType' substitutionGroup='Event'>
    <xs:annotation>
      <xs:documentation>
        An abstract interface event
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='InterfaceStatesType'>
    <xs:annotation>
      <xs:documentation>
        The state of the interface
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='UNAVAILABLE'>
        <xs:annotation>
          <xs:documentation>
            The value is unavailable
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ENABLED'>
        <xs:annotation>
          <xs:documentation>
            The interface is enabled
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DISABLED'>
        <xs:annotation>
          <xs:documentation>
            The interface is disabled
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>