MTConnectDevices_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:MTConnectDevices:1.7' xmlns:mt='urn:mtconnect.org:MTConnectDevices:1.7' targetNamespace='urn:mtconnect.org:MTConnectDevices:1.7' elementFormDefault='qualified' attributeFormDefault='unqualified' xmlns:vc='http://www.w3.org/2007/XMLSchema-versioning' vc:minVersion='1.1' xmlns:xlink='http://www.w3.org/1999/xlink'>
  <xs:import namespace='http://www.w3.org/1999/xlink' schemaLocation='xlink.xsd'/>
  <xs:element name='MTConnectDevices' type='MTConnectDevicesType'>
    <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='AssetCountValueType'>
    <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:complexType name='AssetCountsType'>
    <xs:annotation>
      <xs:documentation>
        The total number of mtconnect asset in anagent.
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:element name='AssetCount' type='AssetCountType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            The total number of mtconnect asset in anagent.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='AssetCountType'>
    <xs:annotation>
      <xs:documentation>
        The total number of mtconnect asset in anagent.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='AssetCountValueType'>
        <xs:attribute name='assetType' type='AssetAttrTypeType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The type of asset that was updated.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='HeaderType'>
    <xs:annotation>
      <xs:documentation>
        Supplemental data usually placed at the beginning of a
        {{term(Document)}}.
      </xs:documentation>
    </xs:annotation>
	<xs:sequence>
      <xs:element name='AssetCounts' type='AssetCountsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The total number of mtconnect asset in anagent.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
	<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='assetBufferSize' type='AssetBufferSizeType' use='required'>
	  <xs:annotation>
		<xs:documentation>
		  The maximum number of assets
		</xs:documentation>
	  </xs:annotation>
	</xs:attribute>
	<xs:attribute name='assetCount' type='AssetCountAttrType' use='required'>
	  <xs:annotation>
		<xs:documentation>
		  The number of assets we have
		</xs:documentation>
	  </xs:annotation>
	</xs:attribute>
  </xs:complexType>
  <xs:complexType name='MTConnectDevicesType'>
    <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='Devices' type='DevicesType'>
        <xs:annotation>
          <xs:documentation>
            {{block(Devices)}} **MUST** {{term(organize)}} one or more
            {{block(Device)}} elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <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:simpleType name='Iso841ClassType'>
    <xs:annotation>
      <xs:documentation>
        The ISO 841 classification for the device
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'/>
  </xs:simpleType>
  <xs:simpleType name='ModelType'>
    <xs:annotation>
      <xs:documentation>
        The model name
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:complexType name='DevicesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Devices)}} **MUST** {{term(organize)}} one or more
        {{block(Device)}} elements.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Agent' type='AgentType'>
        <xs:annotation>
          <xs:documentation>
            Software that collects data published from one or more piece(s) of
            equipment, organizes that data in a structured manner, and responds
            to requests for data from client software systems by providing a
            structured response in the form of a {{term(Response Document)}}
            that is constructed using the {{term(semantic data model)}} of a
            Standard. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Device' type='DeviceType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            A {{term(Device)}} is a {{term(Component)}} representing a piece of
            equipment or a manufacturing system that produces observations about
            itself or publishes data. It organizes its parts as
            {{termplural(Component)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='ComponentType' abstract='true'>
    <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:all>
      <xs:element name='Description' type='ComponentDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Configuration' type='ComponentConfigurationType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Configuration)}} contains technical information about a
            piece of equipment describing its physical layout, functional
            characteristics, and relationships with other pieces of equipment.
            See {{sect(Configuration)}} for details on {{block(Configuration)}}
            model.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='DataItems' type='DataItemsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation/>
        </xs:annotation>
      </xs:element>
      <xs:element name='Components' type='ComponentsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Components)}} {{termplural(organize)}} {{block(Component)}}
            elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Compositions' type='CompositionsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            Compositions Model
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='References' type='ReferencesType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            References Model
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The unique identifier for this element.
        </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='sampleInterval' type='SampleIntervalType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The rate at which the data is sampled from the component
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sampleRate' type='DataItemSampleRateType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          DEPRECATED: The rate at which the data is sampled from the component
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Component' type='ComponentType'>
    <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:element>
  <xs:complexType name='ComponentDescriptionType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        The descriptive information. This can be manufacturer specific
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:any processContents='lax' minOccurs='0' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            The content of the description can text or XML elements
          </xs:documentation>
        </xs:annotation>
      </xs:any>
    </xs:all>
    <xs:attribute name='manufacturer' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The manufacturer
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='model' type='ModelType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The model
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='serialNumber' type='SerialNumberAttrType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The serial number associated with a {{block(Component)}},
          {{block(Asset)}}, or {{block(Device)}}.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='station' type='StationType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          A storage or mounting location for a tool associated with a
          {{block(Turret)}}, {{block(GangToolBar)}}, or {{block(ToolRack)}}.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:complexType name='CommonComponentType'>
    <xs:annotation>
      <xs:documentation>
        An abstract component that has an optional uuid
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ComponentType'>
        <xs:attribute name='uuid' type='UuidType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The component&apos;s universally unique id.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='name' type='NameType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The component&apos;s name
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='CommonComponent' type='CommonComponentType' substitutionGroup='Component'>
    <xs:annotation>
      <xs:documentation>
        An abstract component that has an optional uuid
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Components)}} {{termplural(organize)}} {{block(Component)}}
        elements.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='Component' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='DeviceType'>
    <xs:annotation>
      <xs:documentation>
        A {{term(Device)}} is a {{term(Component)}} representing a piece of
        equipment or a manufacturing system that produces observations about
        itself or publishes data. It organizes its parts as
        {{termplural(Component)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ComponentType'>
        <xs:attribute name='iso841Class' type='Iso841ClassType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              DEPRECATED: The device&apos;s ISO-841 classification
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='uuid' type='UuidType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The components universally unique id. This can be composed of the
              manufactures id or name and the serial number.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='name' type='NameType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The Device name.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='mtconnectVersion' type='VersionType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The MTConnect version of the {{term(Devices Information Model)}}
              used to configure the information to be published for a piece of
              equipment in an {{term(MTConnect Response Document)}}.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Device' type='DeviceType' substitutionGroup='Component'>
    <xs:annotation>
      <xs:documentation>
        A {{term(Device)}} is a {{term(Component)}} representing a piece of
        equipment or a manufacturing system that produces observations about
        itself or publishes data. It organizes its parts as
        {{termplural(Component)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AgentType'>
    <xs:annotation>
      <xs:documentation>
        Software that collects data published from one or more piece(s) of
        equipment, organizes that data in a structured manner, and responds to
        requests for data from client software systems by providing a structured
        response in the form of a {{term(Response Document)}} that is
        constructed using the {{term(semantic data model)}} of a Standard. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='DeviceType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Agent' type='AgentType' substitutionGroup='Device'>
    <xs:annotation>
      <xs:documentation>
        Software that collects data published from one or more piece(s) of
        equipment, organizes that data in a structured manner, and responds to
        requests for data from client software systems by providing a structured
        response in the form of a {{term(Response Document)}} that is
        constructed using the {{term(semantic data model)}} of a Standard. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ActuatorType'>
    <xs:annotation>
      <xs:documentation>
        A mechanism for moving or controlling a mechanical part of a piece of
        equipment. It takes energy usually provided by air, electric current, or
        liquid and converts the energy into some kind of motion. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Actuator' type='ActuatorType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        A mechanism for moving or controlling a mechanical part of a piece of
        equipment. It takes energy usually provided by air, electric current, or
        liquid and converts the energy into some kind of motion. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AuxiliaryType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Auxiliary)}} is a {{block(Component)}} that represents
        functional sub-system(s) that provides supplementary or extended
        capabilities for a piece of equipment, but they are not required for the
        basic operation of the equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Auxiliary' type='AuxiliaryType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Auxiliary)}} is a {{block(Component)}} that represents
        functional sub-system(s) that provides supplementary or extended
        capabilities for a piece of equipment, but they are not required for the
        basic operation of the equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AxisType'>
    <xs:annotation>
      <xs:documentation>
        Description
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Axis' type='AxisType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        Description
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='BarFeederType'>
    <xs:annotation>
      <xs:documentation>
        {{block(BarFeeder)}} represents the information for a unit involved in
        delivering bar stock to a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='LoaderType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='BarFeeder' type='BarFeederType' substitutionGroup='Loader'>
    <xs:annotation>
      <xs:documentation>
        {{block(BarFeeder)}} represents the information for a unit involved in
        delivering bar stock to a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ChuckType'>
    <xs:annotation>
      <xs:documentation>
        A mechanism that holds a part, stock material, or any other item in
        place.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Chuck' type='ChuckType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        A mechanism that holds a part, stock material, or any other item in
        place.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ControllerType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Controller)}} organizes information about an intelligent or
        computational function within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Controller' type='ControllerType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Controller)}} organizes information about an intelligent or
        computational function within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CoolantType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Coolant)}} represents the information for a system comprised of
        all the parts involved in distribution and management of fluids that
        remove heat from a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Coolant' type='CoolantType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Coolant)}} represents the information for a system comprised of
        all the parts involved in distribution and management of fluids that
        remove heat from a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DepositionType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Deposition)}} represents the information for a system that
        manages the addition of material or state change of material being
        performed in an additive manufacturing process. For example, this could
        describe the portion of a piece of equipment that manages a material
        extrusion process or a vat polymerization process.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Deposition' type='DepositionType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Deposition)}} represents the information for a system that
        manages the addition of material or state change of material being
        performed in an additive manufacturing process. For example, this could
        describe the portion of a piece of equipment that manages a material
        extrusion process or a vat polymerization process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DielectricType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Dielectric)}} represents the information for a system that
        manages a chemical mixture used in a manufacturing process being
        performed at that piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Dielectric' type='DielectricType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Dielectric)}} represents the information for a system that
        manages a chemical mixture used in a manufacturing process being
        performed at that piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DoorType'>
    <xs:annotation>
      <xs:documentation>
        A mechanical mechanism or closure that can cover a physical access
        portal into a piece of equipment allowing or restricting access to other
        parts of the equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Door' type='DoorType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        A mechanical mechanism or closure that can cover a physical access
        portal into a piece of equipment allowing or restricting access to other
        parts of the equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ElectricType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Electric)}} represents the information for the main power supply
        for device piece of equipment and the distribution of that power
        throughout the equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Electric' type='ElectricType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Electric)}} represents the information for the main power supply
        for device piece of equipment and the distribution of that power
        throughout the equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='EnclosureType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Enclosure)}} represents the information for a structure used to
        contain or isolate a piece of equipment or area.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Enclosure' type='EnclosureType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Enclosure)}} represents the information for a structure used to
        contain or isolate a piece of equipment or area.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='EndEffectorType'>
    <xs:annotation>
      <xs:documentation>
        {{block(EndEffector)}} represents the information for those functions
        that form the last link segment of a piece of equipment. It is the part
        of a piece of equipment that interacts with the manufacturing process.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='EndEffector' type='EndEffectorType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(EndEffector)}} represents the information for those functions
        that form the last link segment of a piece of equipment. It is the part
        of a piece of equipment that interacts with the manufacturing process.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='EnvironmentalType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Environmental)}} represents the information for a unit or
        function involved in monitoring, managing, or conditioning the
        environment around or within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Environmental' type='EnvironmentalType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Environmental)}} represents the information for a unit or
        function involved in monitoring, managing, or conditioning the
        environment around or within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='FeederType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Feeder)}} represents the information for a system that manages
        the delivery of materials within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Feeder' type='FeederType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Feeder)}} represents the information for a system that manages
        the delivery of materials within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HydraulicType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Hydraulic)}} represents the information for a system comprised
        of all the parts involved in moving and distributing pressurized liquid
        throughout the piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Hydraulic' type='HydraulicType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Hydraulic)}} represents the information for a system comprised
        of all the parts involved in moving and distributing pressurized liquid
        throughout the piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='InterfaceType'>
    <xs:annotation>
      <xs:documentation>
        The means by which communication is achieved between independent
        systems.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Interface' type='InterfaceType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        The means by which communication is achieved between independent
        systems.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LinearType'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Linear)}} axis represents the movement of a physical piece of
        equipment, or a portion of the equipment, in a straight line. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AxisType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Linear' type='LinearType' substitutionGroup='Axis'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Linear)}} axis represents the movement of a physical piece of
        equipment, or a portion of the equipment, in a straight line. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LoaderType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Loader)}} represents the information for a unit comprised of all
        the parts involved in moving and distributing materials, parts, tooling,
        and other items to or from a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AuxiliaryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Loader' type='LoaderType' substitutionGroup='Auxiliary'>
    <xs:annotation>
      <xs:documentation>
        {{block(Loader)}} represents the information for a unit comprised of all
        the parts involved in moving and distributing materials, parts, tooling,
        and other items to or from a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LubricationType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Lubrication)}} represents the information for a system comprised
        of all the parts involved in distribution and management of fluids used
        to lubricate portions of the piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Lubrication' type='LubricationType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Lubrication)}} represents the information for a system comprised
        of all the parts involved in distribution and management of fluids used
        to lubricate portions of the piece of equipment.
      </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:complexContent>
      <xs:extension base='ResourceType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Materials' type='MaterialType' substitutionGroup='Resource'>
    <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='PathType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Path)}} represents the information for an independent operation
        or function within a {{block(Controller)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Path' type='PathType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Path)}} represents the information for an independent operation
        or function within a {{block(Controller)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PersonnelType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Personnel)}} provides information about an individual or
        individuals who either control, support, or otherwise interface with a
        piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ResourceType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Personnel' type='PersonnelType' substitutionGroup='Resource'>
    <xs:annotation>
      <xs:documentation>
        {{block(Personnel)}} provides information about an individual or
        individuals who either control, support, or otherwise interface with a
        piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PneumaticType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Pneumatic)}} is a system that uses compressed gasses to actuate
        components or do work within the piece of equipment. Note: Actuation is
        usually performed using a cylinder.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Pneumatic' type='PneumaticType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Pneumatic)}} is a system that uses compressed gasses to actuate
        components or do work within the piece of equipment. Note: Actuation is
        usually performed using a cylinder.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PowerType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Power)}} was **DEPRECATED** in *MTConnect Version 1.1* and was
        replaced by {{block(Availability)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Power' type='PowerType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Power)}} was **DEPRECATED** in *MTConnect Version 1.1* and was
        replaced by {{block(Availability)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessPowerType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessPower)}} represents the information for a power source
        associated with a piece of equipment that supplies energy to the
        manufacturing process separate from the {{block(Electric)}} system.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ProcessPower' type='ProcessPowerType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessPower)}} represents the information for a power source
        associated with a piece of equipment that supplies energy to the
        manufacturing process separate from the {{block(Electric)}} system.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProtectiveType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Protective)}} represents the information for those functions
        that detect or prevent harm or damage to equipment or personnel.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Protective' type='ProtectiveType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation>
        {{block(Protective)}} represents the information for those functions
        that detect or prevent harm or damage to equipment or personnel.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ResourceType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Resource)}} is an abstract {{block(Component)}} that represents
        types of items, materials, and personnel that support the operation of a
        piece of equipment or work to be performed at a location.
        {{block(Resource)}} also represents materials or other items consumed or
        transformed by a piece of equipment for production of parts or other
        types of goods.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Resource' type='ResourceType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Resource)}} is an abstract {{block(Component)}} that represents
        types of items, materials, and personnel that support the operation of a
        piece of equipment or work to be performed at a location.
        {{block(Resource)}} also represents materials or other items consumed or
        transformed by a piece of equipment for production of parts or other
        types of goods.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='RotaryType'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Rotary)}} axis represents any non-linear or rotary movement of
        a physical piece of equipment or a portion of the equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AxisType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Rotary' type='RotaryType' substitutionGroup='Axis'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Rotary)}} axis represents any non-linear or rotary movement of
        a physical piece of equipment or a portion of the equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SensorType'>
    <xs:annotation>
      <xs:documentation>
        A {{term(sensing element)}} that responds to a physical stimulus and
        transmits a resulting signal.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AuxiliaryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Sensor' type='SensorType' substitutionGroup='Auxiliary'>
    <xs:annotation>
      <xs:documentation>
        A {{term(sensing element)}} that responds to a physical stimulus and
        transmits a resulting signal.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='StockType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Stock)}} represents the information for the material that is
        used in a manufacturing process and to which work is applied in a
        machine or piece of equipment to produce parts.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='MaterialType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Stock' type='StockType' substitutionGroup='Materials'>
    <xs:annotation>
      <xs:documentation>
        {{block(Stock)}} represents the information for the material that is
        used in a manufacturing process and to which work is applied in a
        machine or piece of equipment to produce parts.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SystemType'>
    <xs:annotation>
      <xs:documentation>
        {{block(System)}} is a {{block(Component)}} that represents the major
        sub-system(s) that are permanently integrated into a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='System' type='SystemType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(System)}} is a {{block(Component)}} that represents the major
        sub-system(s) that are permanently integrated into a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolingDeliveryType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ToolingDelivery)}} represents the information for a unit
        involved in managing, positioning, storing, and delivering tooling
        within a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AuxiliaryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ToolingDelivery' type='ToolingDeliveryType' substitutionGroup='Auxiliary'>
    <xs:annotation>
      <xs:documentation>
        {{block(ToolingDelivery)}} represents the information for a unit
        involved in managing, positioning, storing, and delivering tooling
        within a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WasteDisposalType'>
    <xs:annotation>
      <xs:documentation>
        {{block(WasteDisposal)}} represents the information for a unit comprised
        of all the parts involved in removing manufacturing byproducts from a
        piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AuxiliaryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='WasteDisposal' type='WasteDisposalType' substitutionGroup='Auxiliary'>
    <xs:annotation>
      <xs:documentation>
        {{block(WasteDisposal)}} represents the information for a unit comprised
        of all the parts involved in removing manufacturing byproducts from a
        piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='StructureType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Structure)}} is a {{block(Component)}} that represents the
        part(s) comprising the rigid bodies of the piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Structure' type='StructureType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Structure)}} is a {{block(Component)}} that represents the
        part(s) comprising the rigid bodies of the piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LinkType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Link)}} is a structural {{block(Component)}} providing a
        connection between {{block(Component)}}s.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='StructureType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Link' type='LinkType' substitutionGroup='Structure'>
    <xs:annotation>
      <xs:documentation>
        {{block(Link)}} is a structural {{block(Component)}} providing a
        connection between {{block(Component)}}s.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TableType'>
    <xs:annotation>
      <xs:documentation>
        A surface for holding an object or material
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='StructureType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Table' type='TableType' substitutionGroup='Structure'>
    <xs:annotation>
      <xs:documentation>
        A surface for holding an object or material
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='WorkEnvelopeType'>
    <xs:annotation>
      <xs:documentation/>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='SystemType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='WorkEnvelope' type='WorkEnvelopeType' substitutionGroup='System'>
    <xs:annotation>
      <xs:documentation/>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='GangToolBarType'>
    <xs:annotation>
      <xs:documentation>
        A tool mounting mechanism that holds any number of tools. Tools are
        located in {{block(Station)}}s. Tools are positioned for use in the
        manufacturing process by linearly positioning the
        {{block(GangToolBar)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ToolingDeliveryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='GangToolBar' type='GangToolBarType' substitutionGroup='ToolingDelivery'>
    <xs:annotation>
      <xs:documentation>
        A tool mounting mechanism that holds any number of tools. Tools are
        located in {{block(Station)}}s. Tools are positioned for use in the
        manufacturing process by linearly positioning the
        {{block(GangToolBar)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='HeatingType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Heating)}} is a system used to deliver controlled amounts of
        heat to achieve a target temperature at a specified heating rate. Note:
        As an example, Energy Delivery Method can be either through Electric
        heaters or Gas burners.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EnvironmentalType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Heating' type='HeatingType' substitutionGroup='Environmental'>
    <xs:annotation>
      <xs:documentation>
        {{block(Heating)}} is a system used to deliver controlled amounts of
        heat to achieve a target temperature at a specified heating rate. Note:
        As an example, Energy Delivery Method can be either through Electric
        heaters or Gas burners.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AutomaticToolChangerType'>
    <xs:annotation>
      <xs:documentation>
        A tool delivery mechanism that moves tools between a
        {{block(ToolMagazine)}} and a {{term(Spindle)}} a {{block(Turret)}}. An
        {{block(AutomaticToolChanger)}} may also transfer tools between a
        location outside of a piece of equipment and a {{block(ToolMagazine)}}
        or {{block(Turret)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ToolingDeliveryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='AutomaticToolChanger' type='AutomaticToolChangerType' substitutionGroup='ToolingDelivery'>
    <xs:annotation>
      <xs:documentation>
        A tool delivery mechanism that moves tools between a
        {{block(ToolMagazine)}} and a {{term(Spindle)}} a {{block(Turret)}}. An
        {{block(AutomaticToolChanger)}} may also transfer tools between a
        location outside of a piece of equipment and a {{block(ToolMagazine)}}
        or {{block(Turret)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Process)}} is an abstract {{block(Component)}} type that
        represents the manufacturing process being executed on a piece of
        equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Process' type='ProcessType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Process)}} is an abstract {{block(Component)}} type that
        represents the manufacturing process being executed on a piece of
        equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolMagazineType'>
    <xs:annotation>
      <xs:documentation>
        A tool storage mechanism that holds any number of tools. Tools are
        located in {{block(Pot)}}s. {{block(Pot)}}s are moved into position to
        transfer tools into or out of the {{block(ToolMagazine)}} by an
        {{block(AutomaticToolChanger)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ToolingDeliveryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ToolMagazine' type='ToolMagazineType' substitutionGroup='ToolingDelivery'>
    <xs:annotation>
      <xs:documentation>
        A tool storage mechanism that holds any number of tools. Tools are
        located in {{block(Pot)}}s. {{block(Pot)}}s are moved into position to
        transfer tools into or out of the {{block(ToolMagazine)}} by an
        {{block(AutomaticToolChanger)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='PartOccurrenceType'>
    <xs:annotation>
      <xs:documentation>
        {{block(PartOccurrence)}} {{term(organize)}} information about a
        specific part as it exists at a specific place and time, such as a
        specific instance of a bracket at a specific timestamp.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ProcessType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='PartOccurrence' type='PartOccurrenceType' substitutionGroup='Process'>
    <xs:annotation>
      <xs:documentation>
        {{block(PartOccurrence)}} {{term(organize)}} information about a
        specific part as it exists at a specific place and time, such as a
        specific instance of a bracket at a specific timestamp.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AdapterType'>
    <xs:annotation>
      <xs:documentation>
        An optional piece of hardware or software that transforms information
        provided by a piece of equipment into a form that can be received by an
        {{term(Agent)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Adapter' type='AdapterType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        An optional piece of hardware or software that transforms information
        provided by a piece of equipment into a form that can be received by an
        {{term(Agent)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ToolRackType'>
    <xs:annotation>
      <xs:documentation>
        A linear or matrixed tool storage mechanism that holds any number of
        tools. Tools are located in {{block(Station)}}s.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ToolingDeliveryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ToolRack' type='ToolRackType' substitutionGroup='ToolingDelivery'>
    <xs:annotation>
      <xs:documentation>
        A linear or matrixed tool storage mechanism that holds any number of
        tools. Tools are located in {{block(Station)}}s.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='TurretType'>
    <xs:annotation>
      <xs:documentation>
        A tool mounting mechanism that holds any number of tools. Tools are
        located in {{block(Station)}}s . Tools are positioned for use in the
        manufacturing process by rotating the {{block(Turret)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ToolingDeliveryType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Turret' type='TurretType' substitutionGroup='ToolingDelivery'>
    <xs:annotation>
      <xs:documentation>
        A tool mounting mechanism that holds any number of tools. Tools are
        located in {{block(Station)}}s . Tools are positioned for use in the
        manufacturing process by rotating the {{block(Turret)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='VacuumType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Vacuum)}} is a system that evacuates gases and liquids from an
        enclosed and sealed space to a controlled negative pressure or a
        molecular density below the prevailing atmospheric level.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EnvironmentalType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Vacuum' type='VacuumType' substitutionGroup='Environmental'>
    <xs:annotation>
      <xs:documentation>
        {{block(Vacuum)}} is a system that evacuates gases and liquids from an
        enclosed and sealed space to a controlled negative pressure or a
        molecular density below the prevailing atmospheric level.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CoolingType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Cooling)}} is a system used to to extract controlled amounts of
        heat to achieve a target temperature at a specified cooling rate. Note:
        As an example, Energy Extraction Method can be via cooling water pipes
        running through the chamber.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='EnvironmentalType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Cooling' type='CoolingType' substitutionGroup='Environmental'>
    <xs:annotation>
      <xs:documentation>
        {{block(Cooling)}} is a system used to to extract controlled amounts of
        heat to achieve a target temperature at a specified cooling rate. Note:
        As an example, Energy Extraction Method can be via cooling water pipes
        running through the chamber.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='OrganizerType'>
    <xs:annotation>
      <xs:documentation>
        {{Organizer}} is an abstract {{block(Component)}} that
        {{termplural(organize)}} similar {{block(Component)}} types together.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Organizer' type='OrganizerType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{Organizer}} is an abstract {{block(Component)}} that
        {{termplural(organize)}} similar {{block(Component)}} types together.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessOccurrenceType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessOccurrence)}} {{termplural(organize)}} information about
        the execution of a specific process that takes place at a specific place
        and time, such as a specific instance of part-milling occurring at a
        specific timestamp.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ProcessType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ProcessOccurrence' type='ProcessOccurrenceType' substitutionGroup='Process'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessOccurrence)}} {{termplural(organize)}} information about
        the execution of a specific process that takes place at a specific place
        and time, such as a specific instance of part-milling occurring at a
        specific timestamp.
      </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:complexContent>
      <xs:extension base='EnvironmentalType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Pressure' type='PressureType' substitutionGroup='Environmental'>
    <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='StructuresType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Structures)}} {{termplural(organize)}} {{block(Structure)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Structures' type='StructuresType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Structures)}} {{termplural(organize)}} {{block(Structure)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AxesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Axes)}} {{termplural(organize)}} {{block(Axis)}} component
        types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Axes' type='AxesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Axes)}} {{termplural(organize)}} {{block(Axis)}} component
        types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='InterfacesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Interfaces)}} {{termplural(organize)}} {{block(Interface)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Interfaces' type='InterfacesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Interfaces)}} {{termplural(organize)}} {{block(Interface)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SystemsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Systems)}} {{termplural(organize)}} {{block(System)}} component
        types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Systems' type='SystemsType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Systems)}} {{termplural(organize)}} {{block(System)}} component
        types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ResourcesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Resources)}} {{termplural(organize)}} {{block(Resource)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Resources' type='ResourcesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Resources)}} {{termplural(organize)}} {{block(Resource)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AuxiliariesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Auxiliaries)}} {{termplural(organize)}} {{block(Auxiliary)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Auxiliaries' type='AuxiliariesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Auxiliaries)}} {{termplural(organize)}} {{block(Auxiliary)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessesType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Processes)}} {{termplural(organize)}} {{block(Process)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Processes' type='ProcessesType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Processes)}} {{termplural(organize)}} {{block(Process)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AdaptersType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Adapters)}} {{termplural(organize)}} {{block(Adapter)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='CommonComponentType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Adapters' type='AdaptersType' substitutionGroup='CommonComponent'>
    <xs:annotation>
      <xs:documentation>
        {{block(Adapters)}} {{termplural(organize)}} {{block(Adapter)}}
        component types. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CompositionsType'>
    <xs:annotation>
      <xs:documentation>
        Compositions Model
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Composition' type='CompositionType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            {{block(Composition)}} is a functional part of a piece of equipment
            contained within a {{block(Component)}} that **MUST NOT** be further
            decomposed into {{block(Component)}}s or {{block(Composition)}}s. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='CompositionEnumTypeExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for The vocab for the type of composition
      </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='CompositionEnumTypeEnum'>
    <xs:annotation>
      <xs:documentation>
        The vocab for the type of composition
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ACTUATOR'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for moving or controlling a mechanical part of a piece
            of equipment. It takes energy usually provided by air, electric
            current, or liquid and converts the energy into some kind of motion.
            
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AMPLIFIER'>
        <xs:annotation>
          <xs:documentation>
            An electronic component or circuit for amplifying power, electric
            current, or voltage.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BALLSCREW'>
        <xs:annotation>
          <xs:documentation>
            A mechanical structure for transforming rotary motion into linear
            motion.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BELT'>
        <xs:annotation>
          <xs:documentation>
            An endless flexible band used to transmit motion for a piece of
            equipment or to convey materials and objects.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BRAKE'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for slowing or stopping a moving object by the
            absorption or transfer of the energy of momentum, usually by means
            of friction, electrical force, or magnetic force.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHAIN'>
        <xs:annotation>
          <xs:documentation>
            An interconnected series of objects that band together and are used
            to transmit motion for a piece of equipment or to convey materials
            and objects.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHOPPER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism used to break material into smaller pieces.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHUCK'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that holds a part, stock material, or any other item in
            place.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHUTE'>
        <xs:annotation>
          <xs:documentation>
            An inclined channel for conveying material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CIRCUIT_BREAKER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for interrupting an electric circuit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CLAMP'>
        <xs:annotation>
          <xs:documentation>
            A mechanism used to strengthen, support, or fasten objects in place.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COMPRESSOR'>
        <xs:annotation>
          <xs:documentation>
            A pump or other mechanism for reducing volume and increasing
            pressure of gases in order to condense the gases to drive
            pneumatically powered pieces of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DOOR'>
        <xs:annotation>
          <xs:documentation>
            A mechanical mechanism or closure that can cover a physical access
            portal into a piece of equipment allowing or restricting access to
            other parts of the equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DRAIN'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that allows material to flow for the purpose of drainage
            from, for example, a vessel or tank.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ENCODER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism used to measure rotary position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EXPOSURE_UNIT'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for emitting a type of radiation
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EXTRUSION_UNIT'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for dispensing liquid or powered materials
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FAN'>
        <xs:annotation>
          <xs:documentation>
            Any mechanism for producing a current of air.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FILTER'>
        <xs:annotation>
          <xs:documentation>
            Any substance or structure through which liquids or gases are passed
            to remove suspended impurities or to recover solids.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GALVANOMOTOR'>
        <xs:annotation>
          <xs:documentation>
            An electromechanical actuator that produces deflection of a beam of
            light or energy in response to electric current through its coil in
            a magnetic field.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GRIPPER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that holds a part, stock material, or any other item in
            place.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='HOPPER'>
        <xs:annotation>
          <xs:documentation>
            A chamber or bin in which materials are stored temporarily,
            typically being filled through the top and dispensed through the
            bottom.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LINEAR_POSITION_FEEDBACK'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that measures linear motion or position.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MOTOR'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that converts electrical, pneumatic, or hydraulic energy
            into mechanical energy.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OIL'>
        <xs:annotation>
          <xs:documentation>
            A viscous liquid.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POWER_SUPPLY'>
        <xs:annotation>
          <xs:documentation>
            A unit that provides power to electric mechanisms.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PULLEY'>
        <xs:annotation>
          <xs:documentation>
            A mechanism or wheel that turns in a frame or block and serves to
            change the direction of or to transmit force.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PUMP'>
        <xs:annotation>
          <xs:documentation>
            An apparatus raising, driving, exhausting, or compressing fluids or
            gases by means of a piston, plunger, or set of rotating vanes.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REEL'>
        <xs:annotation>
          <xs:documentation>
            A rotary storage unit for material
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SENSING_ELEMENT'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that provides a signal or measured value.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SPREADER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for flattening or spreading materials
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STORAGE_BATTERY'>
        <xs:annotation>
          <xs:documentation>
            A component consisting of one or more cells, in which chemical
            energy is converted into electricity and used as a source of power. 
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SWITCH'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for turning on or off an electric current or for making
            or breaking a circuit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TABLE'>
        <xs:annotation>
          <xs:documentation>
            A surface for holding an object or material
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TANK'>
        <xs:annotation>
          <xs:documentation>
            A receptacle or container for holding material.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TENSIONER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that provides or applies a stretch or strain to another
            mechanism.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TRANSFORMER'>
        <xs:annotation>
          <xs:documentation>
            A mechanism that transforms electric energy from a source to a
            secondary circuit.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VALVE'>
        <xs:annotation>
          <xs:documentation>
            Any mechanism for halting or controlling the flow of a liquid, gas,
            or other material through a passage, pipe, inlet, or outlet.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VAT'>
        <xs:annotation>
          <xs:documentation>
            A container for liquid or powdered materials
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='WATER'>
        <xs:annotation>
          <xs:documentation>
            A fluid.
          </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='WORKPIECE'>
        <xs:annotation>
          <xs:documentation>
            An object or material on which a form of work is performed.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COOLING_TOWER'>
        <xs:annotation>
          <xs:documentation>
            A heat exchange system that uses a fluid to transfer heat to the
            atmosphere.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='POT'>
        <xs:annotation>
          <xs:documentation>
            A tool storage location associated with a {{block(ToolMagazine)}} or
            {{block(AutomaticToolChanger)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STATION'>
        <xs:annotation>
          <xs:documentation>
            A storage or mounting location for a tool associated with a
            {{block(Turret)}}, {{block(GangToolBar)}}, or {{block(ToolRack)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TRANSFER_ARM'>
        <xs:annotation>
          <xs:documentation>
            A mechanism for physically moving a tool from one location to
            another.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TRANSFER_POT'>
        <xs:annotation>
          <xs:documentation>
            A {{block(Pot)}} for a tool awaiting transfer from a
            {{block(ToolMagazine)}} to {{term(Spindle)}} or {{block(Turret)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='RETURN_POT'>
        <xs:annotation>
          <xs:documentation>
            A {{block(Pot)}} for a tool removed from {{term(Spindle)}} or
            {{block(Turret)}} and awaiting for return to a
            {{block(ToolMagazine)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STAGING_POT'>
        <xs:annotation>
          <xs:documentation>
            A {{block(Pot)}} for a tool awaiting transfer to a
            {{block(ToolMagazine)}} or {{block(Turret)}} from outside of the
            piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='REMOVAL_POT'>
        <xs:annotation>
          <xs:documentation>
            A {{block(Pot)}} for a tool to be removed from a
            {{block(ToolMagazine)}} or {{block(Turret)}} to a location outside
            of the piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='EXPIRED_POT'>
        <xs:annotation>
          <xs:documentation>
            A {{block(Pot)}} for a tool that is no longer useable for removal
            from a {{block(ToolMagazine)}} or {{block(Turret)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='CompositionEnumTypeType'>
    <xs:annotation>
      <xs:documentation>
        The vocab for the type of composition
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='CompositionEnumTypeEnum CompositionEnumTypeExtType'/>
  </xs:simpleType>
  <xs:complexType name='CompositionType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Composition)}} is a functional part of a piece of equipment
        contained within a {{block(Component)}} that **MUST NOT** be further
        decomposed into {{block(Component)}}s or {{block(Composition)}}s. 
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='ComponentDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Configuration' type='ComponentConfigurationType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Configuration)}} contains technical information about a
            piece of equipment describing its physical layout, functional
            characteristics, and relationships with other pieces of equipment.
            See {{sect(Configuration)}} for details on {{block(Configuration)}}
            model.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The unique identifier for this element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='uuid' type='UuidType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The composition&apos;s universally unique id.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The data item identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='CompositionEnumTypeType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The type of composition
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:simpleType name='IdRefType'>
    <xs:annotation>
      <xs:documentation>
        A reference to an identifier
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:complexType name='ReferencesType'>
    <xs:annotation>
      <xs:documentation>
        References Model
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='Reference' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='ReferenceType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        {{block(Reference)}} is a pointer to information that is associated with
        another {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='idRef' type='IdRefType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A reference to an id in the MTConnectDevices model
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          An optional name of the referenced item, used for documentation
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Reference' type='ReferenceType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Reference)}} is a pointer to information that is associated with
        another {{term(Structural Element)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DataItemRefType'>
    <xs:annotation>
      <xs:documentation>
        {{block(DataItemRef)}} is a pointer to a {{term(Data Entity)}}
        associated with another {{term(Structural Element)}} defined for a piece
        of equipment. {{block(DataItemRef)}} allows the data associated with a
        data item defined in another {{term(Structural Element)}} to be directly
        associated with this element.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ReferenceType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='DataItemRef' type='DataItemRefType' substitutionGroup='Reference'>
    <xs:annotation>
      <xs:documentation>
        {{block(DataItemRef)}} is a pointer to a {{term(Data Entity)}}
        associated with another {{term(Structural Element)}} defined for a piece
        of equipment. {{block(DataItemRef)}} allows the data associated with a
        data item defined in another {{term(Structural Element)}} to be directly
        associated with this element.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentRefType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ComponentRef)}} is a pointer to all of the information
        associated with another {{term(Structural Element)}} defined for a piece
        of equipment. {{block(ComponentRef)}} allows all of the information
        ({{term(Lower Level)}} {{block(Components)}} and all {{termplural(Data
        Entity)}}) that is associated with the other {{term(Structural
        Element)}} to be directly associated with this element.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='ReferenceType'/>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ComponentRef' type='ComponentRefType' substitutionGroup='Reference'>
    <xs:annotation>
      <xs:documentation>
        {{block(ComponentRef)}} is a pointer to all of the information
        associated with another {{term(Structural Element)}} defined for a piece
        of equipment. {{block(ComponentRef)}} allows all of the information
        ({{term(Lower Level)}} {{block(Components)}} and all {{termplural(Data
        Entity)}}) that is associated with the other {{term(Structural
        Element)}} to be directly associated with this element.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='AbstractConfigurationType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        Abstract configuration
      </xs:documentation>
    </xs:annotation>
  </xs:complexType>
  <xs:element abstract='true' name='AbstractConfiguration' type='AbstractConfigurationType'>
    <xs:annotation>
      <xs:documentation>
        Abstract configuration
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentConfigurationType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        The configuration data associated with this component.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='AbstractConfiguration' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='CalibrationDateType'>
    <xs:annotation>
      <xs:documentation>
        The time the calibration was preformed
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:date'/>
  </xs:simpleType>
  <xs:simpleType name='NextCalibrationDateType'>
    <xs:annotation>
      <xs:documentation>
        The time the next calibration should be preformed
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:date'/>
  </xs:simpleType>
  <xs:simpleType name='CalibrationInitialsType'>
    <xs:annotation>
      <xs:documentation>
        The initials of the person doing the calibration
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='FirmwareVersionType'>
    <xs:annotation>
      <xs:documentation>
        The firmware version of this sensor
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='ChannelNumberType'>
    <xs:annotation>
      <xs:documentation>
        The channel number
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:integer'/>
  </xs:simpleType>
  <xs:complexType name='SensorConfigurationType'>
    <xs:annotation>
      <xs:documentation>
        {{block(SensorConfiguration)}} contains configuration information about
        a {{block(Sensor)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:all>
          <xs:element name='FirmwareVersion' type='FirmwareVersionType'>
            <xs:annotation>
              <xs:documentation>
                Version number for the sensor unit as specified by the
                manufacturer. 
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='CalibrationDate' type='CalibrationDateType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                Date upon which the {{term(sensor unit)}} was last calibrated to
                the {{term(sensor element)}}.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='NextCalibrationDate' type='NextCalibrationDateType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                Date upon which the {{term(sensor element)}} is next scheduled
                to be calibrated with the {{term(sensor unit)}}. 
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='CalibrationInitials' type='CalibrationInitialsType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The initials of the person verifying the validity of the
                calibration data.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:any processContents='strict' notNamespace='##targetNamespace' minOccurs='0' maxOccurs='unbounded'>
            <xs:annotation>
              <xs:documentation>
                Any additional properties
              </xs:documentation>
            </xs:annotation>
          </xs:any>
          <xs:element name='Channels' type='ChannelsType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                {{block(Channels)}} {{termplural(organize)}} {{block(Channel)}}
                elements. 
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='SensorConfiguration' type='SensorConfigurationType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(SensorConfiguration)}} contains configuration information about
        a {{block(Sensor)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ChannelsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Channels)}} {{termplural(organize)}} {{block(Channel)}}
        elements. 
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Channel' type='ChannelType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            When {{block(Sensor)}} represents multiple {{termplural(sensing
            element)}}, each {{term(sensing element)}} is represented by a
            {{block(Channel)}} for the {{block(Sensor)}}. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='ChannelType'>
    <xs:annotation>
      <xs:documentation>
        When {{block(Sensor)}} represents multiple {{termplural(sensing
        element)}}, each {{term(sensing element)}} is represented by a
        {{block(Channel)}} for the {{block(Sensor)}}. 
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='DescriptionTextType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='CalibrationDate' type='CalibrationDateType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            Date upon which the {{term(sensor unit)}} was last calibrated to the
            {{term(sensor element)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='NextCalibrationDate' type='NextCalibrationDateType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            Date upon which the {{term(sensor element)}} is next scheduled to be
            calibrated with the {{term(sensor unit)}}. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='CalibrationInitials' type='CalibrationInitialsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The initials of the person verifying the validity of the calibration
            data.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attribute name='number' type='ChannelNumberType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The channel id
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The channel name
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:simpleType name='LimitValueType'>
    <xs:annotation>
      <xs:documentation>
        The limit of a value
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='PeakType'>
    <xs:annotation>
      <xs:documentation>
        The peak value
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:complexType name='SpecificationsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Specifications)}} {{termplural(organize)}}
        {{block(Specification)}} elements for a {{block(Component)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:all>
          <xs:element ref='AbstractSpecification' minOccurs='1' maxOccurs='unbounded'/>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Specifications' type='SpecificationsType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(Specifications)}} {{termplural(organize)}}
        {{block(Specification)}} elements for a {{block(Component)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='OriginatorEnumExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for A reference to the creator of the Specification
      </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='OriginatorEnumEnum'>
    <xs:annotation>
      <xs:documentation>
        A reference to the creator of the Specification
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='MANUFACTURER'>
        <xs:annotation>
          <xs:documentation>
            The manufacturer of a piece of equipment or component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='USER'>
        <xs:annotation>
          <xs:documentation>
            The owner or implementer of a piece of equipment or component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='OriginatorEnumType'>
    <xs:annotation>
      <xs:documentation>
        A reference to the creator of the Specification
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='OriginatorEnumEnum OriginatorEnumExtType'/>
  </xs:simpleType>
  <xs:complexType name='AbstractSpecificationType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        A specification
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The identity of the Specificaiton
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='DataItemEnumType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The type of measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='originator' type='OriginatorEnumType' use='optional' default='MANUFACTURER'>
      <xs:annotation>
        <xs:documentation>
          A reference to the creator of the Specification
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='subType' type='DataItemSubEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The type of measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The name of the spec
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='dataItemIdRef' type='SourceDataItemIdType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional data item identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='compositionIdRef' type='CompositionIdType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional composition identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='coordinateSystemIdRef' type='CoordinateSystemIdRefType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional coordinate system identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='units' type='UnitsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The units
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='AbstractSpecification' type='AbstractSpecificationType'>
    <xs:annotation>
      <xs:documentation>
        A specification
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='SpecificationType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Specification)}} elements define information describing the
        design characteristics for a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractSpecificationType'>
        <xs:all>
          <xs:element name='Maximum' type='MaximumType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                If the data reported for a data item is a range of numeric
                values, the expected value reported **MAY** be described with an
                upper limit defined by this constraint.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Minimum' type='MinimumType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                If the data reported for a data item is a range of numeric
                values, the expected value reported **MAY** be described with a
                lower limit defined by this constraint.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Nominal' type='NominalType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The target or expected value for this data item.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='UpperLimit' type='UpperLimitType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The upper conformance boundary for a variable. Note to Entry:
                immediate concern or action may be required. 
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='UpperWarning' type='UpperWarningType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The upper boundary indicating increased concern and supervision
                may be required.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='LowerWarning' type='LowerWarningType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The lower boundary indicating increased concern and supervision
                may be required.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='LowerLimit' type='LowerLimitType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The lower conformance boundary for a variable. Note to Entry:
                immediate concern or action may be required.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Specification' type='SpecificationType' substitutionGroup='AbstractSpecification'>
    <xs:annotation>
      <xs:documentation>
        {{block(Specification)}} elements define information describing the
        design characteristics for a piece of equipment. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ConstraintType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        The limit of a constraint
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='LimitValueType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element abstract='true' name='Constraint' type='ConstraintType'>
    <xs:annotation>
      <xs:documentation>
        The limit of a constraint
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MaximumType'>
    <xs:annotation>
      <xs:documentation>
        If the data reported for a data item is a range of numeric values, the
        expected value reported **MAY** be described with an upper limit defined
        by this constraint.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Maximum' type='MaximumType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        If the data reported for a data item is a range of numeric values, the
        expected value reported **MAY** be described with an upper limit defined
        by this constraint.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='MinimumType'>
    <xs:annotation>
      <xs:documentation>
        If the data reported for a data item is a range of numeric values, the
        expected value reported **MAY** be described with a lower limit defined
        by this constraint.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Minimum' type='MinimumType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        If the data reported for a data item is a range of numeric values, the
        expected value reported **MAY** be described with a lower limit defined
        by this constraint.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='NominalType'>
    <xs:annotation>
      <xs:documentation>
        The target or expected value for this data item.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='Nominal' type='NominalType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        The target or expected value for this data item.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='UpperLimitType'>
    <xs:annotation>
      <xs:documentation>
        The upper conformance boundary for a variable. Note to Entry: immediate
        concern or action may be required. 
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='UpperLimit' type='UpperLimitType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        The upper conformance boundary for a variable. Note to Entry: immediate
        concern or action may be required. 
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='UpperWarningType'>
    <xs:annotation>
      <xs:documentation>
        The upper boundary indicating increased concern and supervision may be
        required.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='UpperWarning' type='UpperWarningType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        The upper boundary indicating increased concern and supervision may be
        required.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LowerWarningType'>
    <xs:annotation>
      <xs:documentation>
        The lower boundary indicating increased concern and supervision may be
        required.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LowerWarning' type='LowerWarningType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        The lower boundary indicating increased concern and supervision may be
        required.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='LowerLimitType'>
    <xs:annotation>
      <xs:documentation>
        The lower conformance boundary for a variable. Note to Entry: immediate
        concern or action may be required.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ConstraintType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:element name='LowerLimit' type='LowerLimitType' substitutionGroup='Constraint'>
    <xs:annotation>
      <xs:documentation>
        The lower conformance boundary for a variable. Note to Entry: immediate
        concern or action may be required.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ProcessSpecificationType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessSpecification)}} provides information used to assess the
        conformance of a variable to process requirements. See {{sect(Limits for
        ProcessSpecification)}} for details on the
        {{block(ProcessSpecification)}} model.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractSpecificationType'>
        <xs:all>
          <xs:element name='ControlLimits' type='ControlLimitsType' minOccurs='0' maxOccurs='1'>
            <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:element name='AlarmLimits' type='AlarmLimitsType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                A set of limits used to trigger warning or alarm indicators.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='SpecificationLimits' type='SpecificationLimitsType' minOccurs='0' maxOccurs='1'>
            <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:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ProcessSpecification' type='ProcessSpecificationType' substitutionGroup='AbstractSpecification'>
    <xs:annotation>
      <xs:documentation>
        {{block(ProcessSpecification)}} provides information used to assess the
        conformance of a variable to process requirements. See {{sect(Limits for
        ProcessSpecification)}} for details on the
        {{block(ProcessSpecification)}} model.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ControlLimitsType'>
    <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:all>
      <xs:element name='UpperLimit' type='UpperLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The upper conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='UpperWarning' type='UpperWarningType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The upper boundary indicating increased concern and supervision may
            be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Nominal' type='NominalType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The target or expected value for this data item.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='LowerWarning' type='LowerWarningType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The lower boundary indicating increased concern and supervision may
            be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='LowerLimit' type='LowerLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The lower conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='AlarmLimitsType'>
    <xs:annotation>
      <xs:documentation>
        A set of limits used to trigger warning or alarm indicators.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='UpperLimit' type='UpperLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The upper conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='UpperWarning' type='UpperWarningType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The upper boundary indicating increased concern and supervision may
            be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='LowerWarning' type='LowerWarningType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The lower boundary indicating increased concern and supervision may
            be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='LowerLimit' type='LowerLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The lower conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='SpecificationLimitsType'>
    <xs:annotation>
      <xs:documentation>
        A set of limits defining a range of values designating acceptable
        performance for a variable.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='UpperLimit' type='UpperLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The upper conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Nominal' type='NominalType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The target or expected value for this data item.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='LowerLimit' type='LowerLimitType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The lower conformance boundary for a variable. Note to Entry:
            immediate concern or action may be required.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='RelationshipsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Relationships)}} {{termplural(organize)}} one or more
        {{block(DataItemRelationship)}} and
        {{block(SpecificationRelationship)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:all>
          <xs:element ref='Relationship' minOccurs='1' maxOccurs='unbounded'/>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Relationships' type='RelationshipsType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(Relationships)}} {{termplural(organize)}} one or more
        {{block(DataItemRelationship)}} and
        {{block(SpecificationRelationship)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='RelationshipTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        The list of possible association types
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='PARENT'>
        <xs:annotation>
          <xs:documentation>
            The related entity is a parent
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CHILD'>
        <xs:annotation>
          <xs:documentation>
            The related entity is a child
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PEER'>
        <xs:annotation>
          <xs:documentation>
            The related entity is a peer
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DeviceRoleEnumType'>
    <xs:annotation>
      <xs:documentation>
        device relationships
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='SYSTEM'>
        <xs:annotation>
          <xs:documentation>
            a system
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='AUXILIARY'>
        <xs:annotation>
          <xs:documentation>
            an auxiliary
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='CriticalityEnumType'>
    <xs:annotation>
      <xs:documentation>
        The criticality
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='CRITICAL'>
        <xs:annotation>
          <xs:documentation>
            critical
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NONCRITICAL'>
        <xs:annotation>
          <xs:documentation>
            Not critical
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='RelationshipType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        {{block(Relationship)}} describes the association between two pieces of
        equipment that function independently but together perform a
        manufacturing operation.
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The relationship identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional name of the relationship
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='RelationshipTypeEnumType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The assciation type
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='criticality' type='CriticalityEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          Criticality
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='Relationship' type='RelationshipType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Relationship)}} describes the association between two pieces of
        equipment that function independently but together perform a
        manufacturing operation.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='ComponentRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        {{block(ComponentRelationship)}} describes the association between two
        components within a piece of equipment that function independently but
        together perform a capability or service within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='RelationshipType'>
        <xs:attribute name='idRef' type='IdRefType' use='required'>
          <xs:annotation>
            <xs:documentation>
              A reference to the device uuid
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='ComponentRelationship' type='ComponentRelationshipType' substitutionGroup='Relationship'>
    <xs:annotation>
      <xs:documentation>
        {{block(ComponentRelationship)}} describes the association between two
        components within a piece of equipment that function independently but
        together perform a capability or service within a piece of equipment.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='DeviceRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        {{block(DeviceRelationship)}} describes the association between two
        pieces of equipment that function independently but together perform a
        manufacturing operation.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='RelationshipType'>
        <xs:attribute name='deviceUuidRef' type='UuidType' use='required'>
          <xs:annotation>
            <xs:documentation>
              A reference to the device uuid
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='role' type='DeviceRoleEnumType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The type of relatiship
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='href' type='xlink:hrefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The {{term(URL)}} giving the location of the Solid Model. If not
              present, the model referenced in the
              {{property(solidModelIdRef,SolidModel)}} is used.
              {{property(href,SolidModel)}} is of type `xlink:href` from the W3C
              XLink specification.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute ref='xlink:type' use='optional' fixed='locator'>
          <xs:annotation>
            <xs:documentation>
              The XLink {{property(type)}} attribute **MUST** have a fixed value
              of `locator` as defined in W3C XLink 1.1
              {{cite(https://www.w3.org/TR/xlink11/)}}. If the
              {{property(href)}} attribute is provided, it **MUST** conform to
              the URI syntactic rules as defined in IETF RFC 3986 for Uniform
              Resource Identifiers.
              {{cite(https://www.ietf.org/rfc/rfc3986.txt)}}
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='DeviceRelationship' type='DeviceRelationshipType' substitutionGroup='Relationship'>
    <xs:annotation>
      <xs:documentation>
        {{block(DeviceRelationship)}} describes the association between two
        pieces of equipment that function independently but together perform a
        manufacturing operation.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='CoordinateSystemTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        The type of coordinate system
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='WORLD'>
        <xs:annotation>
          <xs:documentation>
            The world
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='BASE'>
        <xs:annotation>
          <xs:documentation>
            The base of the manipulator chain
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OBJECT'>
        <xs:annotation>
          <xs:documentation>
            The object
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TASK'>
        <xs:annotation>
          <xs:documentation>
            The current task
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MECHANICAL_INTERFACE'>
        <xs:annotation>
          <xs:documentation>
            The last joint in the chain
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TOOL'>
        <xs:annotation>
          <xs:documentation>
            The tool&apos;s coord
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MOBILE_PLATFORM'>
        <xs:annotation>
          <xs:documentation>
            The platform
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='MACHINE'>
        <xs:annotation>
          <xs:documentation>
            For machine tools, the coordinate system in the work area
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CAMERA'>
        <xs:annotation>
          <xs:documentation>
            For machine tools, the coordinate system in the work area
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='CoordinateSystemsType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        {{block(CoordinateSystems)}} {{termplural(organize)}}
        {{block(CoordinateSystem)}} elements for a {{block(Component)}} and its
        children.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:all>
          <xs:element name='CoordinateSystem' type='CoordinateSystemType' minOccurs='1' maxOccurs='unbounded'>
            <xs:annotation>
              <xs:documentation>
                A {{block(CoordinateSystem)}} is a reference system that
                associates a unique set of n parameters with each point in an
                n-dimensional space. {{cite(Ref: ISO 10303-218:2004)}}
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:all>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='CoordinateSystems' type='CoordinateSystemsType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(CoordinateSystems)}} {{termplural(organize)}}
        {{block(CoordinateSystem)}} elements for a {{block(Component)}} and its
        children.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:complexType name='CoordinateSystemType'>
    <xs:annotation>
      <xs:documentation>
        A {{block(CoordinateSystem)}} is a reference system that associates a
        unique set of n parameters with each point in an n-dimensional space.
        {{cite(Ref: ISO 10303-218:2004)}}
      </xs:documentation>
    </xs:annotation>
    <xs:choice minOccurs='0' maxOccurs='1'>
      <xs:element name='Origin' type='OriginType'>
        <xs:annotation>
          <xs:documentation>
            A fixed point from which measurement or motion commences.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Transformation' type='TransformationType'>
        <xs:annotation>
          <xs:documentation>
            The translation of the origin to the position and orientation. At a
            minimum, a {{block(Translation)}} or {{block(Rotation)}} **MUST** be
            given.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:choice>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The coordinate system identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional name of the coordinate system
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='nativeName' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional name of the coordinate system
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='parentIdRef' type='IdRefType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The parent of the coordinate system
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='CoordinateSystemTypeEnumType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The coordinate system type
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:complexType name='OriginType'>
    <xs:annotation>
      <xs:documentation>
        A fixed point from which measurement or motion commences.
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ThreeSpaceValueType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='TransformationType'>
    <xs:annotation>
      <xs:documentation>
        The translation of the origin to the position and orientation. At a
        minimum, a {{block(Translation)}} or {{block(Rotation)}} **MUST** be
        given.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Translation' type='ThreeSpaceValueType'>
        <xs:annotation>
          <xs:documentation>
            An offset applied first
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Rotation' type='ThreeSpaceValueType'>
        <xs:annotation>
          <xs:documentation>
            A three space angular rotation relative to a coordinate system.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='MotionTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        The types of motion
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='REVOLUTE'>
        <xs:annotation>
          <xs:documentation>
            Rotates around an axis with a fixed range of motion
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONTINUOUS'>
        <xs:annotation>
          <xs:documentation>
            Revolves around an axis with a continuous range of motion
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PRISMATIC'>
        <xs:annotation>
          <xs:documentation>
            Sliding linear motion along an axis with a fixed range of motion
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='FIXED'>
        <xs:annotation>
          <xs:documentation>
            The axis does not move.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='ActuationTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        The actuation of this component
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='DIRECT'>
        <xs:annotation>
          <xs:documentation>
            The movement is initiated by the component.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VIRTUAL'>
        <xs:annotation>
          <xs:documentation>
            The motion is computed and is used for expressing an imaginary
            movement.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='NONE'>
        <xs:annotation>
          <xs:documentation>
            There is no actuation of this Axis.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='MotionAxisType'>
    <xs:annotation>
      <xs:documentation>
        The unit vector along which the motion occurs
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ThreeSpaceValueType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='MotionDescriptionType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        The description of the motion
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:any processContents='lax' minOccurs='0' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            Any elements
          </xs:documentation>
        </xs:annotation>
      </xs:any>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='MotionType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        {{block(Motion)}} defines the movement of the component relative to a
        coordinate system. {{block(Motion)}} specifies the kinematic chain of
        the components.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:sequence>
          <xs:element name='Description' type='MotionDescriptionType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The {{block(Description)}} of the {{block(Definition)}}. See
                {{block(Component)}} {{block(Description)}}.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:choice minOccurs='0' maxOccurs='1'>
            <xs:element name='Origin' type='OriginType'>
              <xs:annotation>
                <xs:documentation>
                  A fixed point from which measurement or motion commences.
                </xs:documentation>
              </xs:annotation>
            </xs:element>
            <xs:element name='Transformation' type='TransformationType'>
              <xs:annotation>
                <xs:documentation>
                  The translation of the origin to the position and orientation.
                  At a minimum, a {{block(Translation)}} or {{block(Rotation)}}
                  **MUST** be given.
                </xs:documentation>
              </xs:annotation>
            </xs:element>
          </xs:choice>
          <xs:element name='Axis' type='MotionAxisType'>
            <xs:annotation>
              <xs:documentation>
                Description
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
        <xs:attribute name='id' type='IDType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The coordinate system identifier
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='parentIdRef' type='IdRefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The parent of the coordinate system
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='coordinateSystemIdRef' type='CoordinateSystemIdRefType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The identifier of the coordinate system that this motion is
              relative to
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='type' type='MotionTypeEnumType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The motion type
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='actuation' type='ActuationTypeEnumType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The actuation method
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='Motion' type='MotionType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(Motion)}} defines the movement of the component relative to a
        coordinate system. {{block(Motion)}} specifies the kinematic chain of
        the components.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='SolidModelIdRefType'>
    <xs:annotation>
      <xs:documentation>
        A reference to another model
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='ItemRefType'>
    <xs:annotation>
      <xs:documentation>
        A reference to an item in a model
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:complexType name='SolidModelType'>
    <xs:annotation>
      <xs:documentation>
        {{block(SolidModel)}} is a {{block(Configuration)}} that references a
        file with the three-dimensional geometry of the {{block(Component)}} or
        {{block(Composition)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractConfigurationType'>
        <xs:all>
          <xs:element name='Transformation' type='TransformationType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The translation of the origin to the position and orientation.
                At a minimum, a {{block(Translation)}} or {{block(Rotation)}}
                **MUST** be given.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Scale' type='SolidModelScaleType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The {{block(SolidModel)}} {{block(Scale)}} is either a single
                multiplier applied to all three dimensions or a three space
                multiplier given in the X, Y, and Z dimensions in the coordinate
                system used for the {{block(SolidModel)}}.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:all>
        <xs:attribute name='id' type='IDType' use='required'>
          <xs:annotation>
            <xs:documentation>
              the unique identifier for this entity within the MTConnectDevices
              document
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='solidModelIdRef' type='SolidModelIdRefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The associated model file if an item reference is used
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='href' type='xlink:hrefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The {{term(URL)}} giving the location of the Solid Model. If not
              present, the model referenced in the
              {{property(solidModelIdRef,SolidModel)}} is used.
              {{property(href,SolidModel)}} is of type `xlink:href` from the W3C
              XLink specification.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute ref='xlink:type' use='optional' fixed='locator'>
          <xs:annotation>
            <xs:documentation>
              The XLink {{property(type)}} attribute **MUST** have a fixed value
              of `locator` as defined in W3C XLink 1.1
              {{cite(https://www.w3.org/TR/xlink11/)}}. If the
              {{property(href)}} attribute is provided, it **MUST** conform to
              the URI syntactic rules as defined in IETF RFC 3986 for Uniform
              Resource Identifiers.
              {{cite(https://www.ietf.org/rfc/rfc3986.txt)}}
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='itemRef' type='ItemRefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The reference to the item within the model within the related
              geometry. A modelIdRef MUST be given.
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='mediaType' type='SolidModelMediaTypeType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The format of the referenced document
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='coordinateSystemIdRef' type='CoordinateSystemIdRefType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The identifier of the coordinate system that this motion is
              relative to
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='SolidModel' type='SolidModelType' substitutionGroup='AbstractConfiguration'>
    <xs:annotation>
      <xs:documentation>
        {{block(SolidModel)}} is a {{block(Configuration)}} that references a
        file with the three-dimensional geometry of the {{block(Component)}} or
        {{block(Composition)}}.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='ScaleValueType'>
    <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='1'/>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='SolidModelScaleType'>
    <xs:annotation>
      <xs:documentation>
        The unit vector to scale the model
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ScaleValueType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:simpleType name='SolidModelMediaTypeExtType'>
    <xs:annotation>
      <xs:documentation>
        Extended tyoe for Solid model media types
      </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='SolidModelMediaTypeEnum'>
    <xs:annotation>
      <xs:documentation>
        Solid model media types
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='STEP'>
        <xs:annotation>
          <xs:documentation>
            ISO 10303 STEP AP203 or AP242 format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='STL'>
        <xs:annotation>
          <xs:documentation>
            Stereolithography file format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='GDML'>
        <xs:annotation>
          <xs:documentation>
            Geometry Description Markup Language
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OBJ'>
        <xs:annotation>
          <xs:documentation>
            Wavefront OBJ file format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COLLADA'>
        <xs:annotation>
          <xs:documentation>
            ISO 17506
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='IGES'>
        <xs:annotation>
          <xs:documentation>
            Initial Graphics Exchange Specification
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='3DS'>
        <xs:annotation>
          <xs:documentation>
            Autodesk file format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='ACIS'>
        <xs:annotation>
          <xs:documentation>
            Dassault file format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='X_T'>
        <xs:annotation>
          <xs:documentation>
            Parasolid XT Siemens data interchange format
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='SolidModelMediaTypeType'>
    <xs:annotation>
      <xs:documentation>
        Solid model media types
      </xs:documentation>
    </xs:annotation>
    <xs:union memberTypes='SolidModelMediaTypeEnum SolidModelMediaTypeExtType'/>
  </xs:simpleType>
  <xs:simpleType name='SampleIntervalType'>
    <xs:annotation>
      <xs:documentation>
        The interval between adjacent sampleing of data
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemSampleRateType'>
    <xs:annotation>
      <xs:documentation>
        The frequency a measurement is sampled
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemOptionType'>
    <xs:annotation>
      <xs:documentation>
        The constrained value for this data item
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemValueType'>
    <xs:annotation>
      <xs:documentation>
        The constrained value for this data item
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'/>
  </xs:simpleType>
  <xs:simpleType name='DataItemNumericValueType'>
    <xs:annotation>
      <xs:documentation>
        The constrained value for this data item
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='SourceComponentIdType'>
    <xs:annotation>
      <xs:documentation>
        An idref to the component id
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='SourceDataItemIdType'>
    <xs:annotation>
      <xs:documentation>
        An idref to the data item id
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='ReferenceIdType'>
    <xs:annotation>
      <xs:documentation>
        The item&apos;s reference to the data item or specificatiton
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='ComponentNameType'>
    <xs:annotation>
      <xs:documentation>
        The name of a related component
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:NMTOKEN'/>
  </xs:simpleType>
  <xs:simpleType name='CoordinateSystemIdRefType'>
    <xs:annotation>
      <xs:documentation>
        The id reference for the coordinate system associated with this data
        item
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:IDREF'/>
  </xs:simpleType>
  <xs:simpleType name='DiscreteType'>
    <xs:annotation>
      <xs:documentation>
        An discrete event
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:boolean'/>
  </xs:simpleType>
  <xs:complexType name='DataItemDescriptionType' mixed='true'>
    <xs:annotation>
      <xs:documentation>
        The description of a data item, can be free form text or elements
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:any processContents='lax' minOccurs='0' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            Any elements
          </xs:documentation>
        </xs:annotation>
      </xs:any>
    </xs:all>
  </xs:complexType>
  <xs:simpleType name='FilterValueType'>
    <xs:annotation>
      <xs:documentation>
        The minimum limit on the change in a value
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='CategoryType'>
    <xs:annotation>
      <xs:documentation>
        The measurement sampling type
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='EVENT'>
        <xs:annotation>
          <xs:documentation>
            An event represents a change in state occurs at a point in time.
            Note: An event does not occur at predefined frequencies.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='SAMPLE'>
        <xs:annotation>
          <xs:documentation>
            A sample is a data point for continuous data items, that is, the
            value of a data item at a point in time.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='CONDITION'>
        <xs:annotation>
          <xs:documentation>
            The condition of the device
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='NativeScaleType'>
    <xs:annotation>
      <xs:documentation>
        The multiplier for the native value. Conversion divides by this value
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:float'/>
  </xs:simpleType>
  <xs:simpleType name='RepresentationType'>
    <xs:annotation>
      <xs:documentation>
        A {{property(representation,DataItem)}} specifies the format and
        structure of the information for an {{term(observation)}}. The default
        {{property(representation,DataItem)}} is `VALUE` indicating the format
        as specified in {{citetitle(MTCPart3)}}. A
        {{property(representation,DataItem)}}, other than `VALUE`, will modify
        the element name of the {{term(observation)}} by appending the pascal
        case of the {{property(representation,DataItem)}} as follows:
        \begin{itemize} \item A {{block(DataItem)}} with {{property(type)}}
        `TEMPERATURE` and {{property(representation,DataItem)}} of `TIME_SERIES`
        becomes `TemperatureTimeSeries` \item **DEPRECATED** A
        {{block(DataItem)}} with {{property(type)}} `PART_COUNT` and
        {{property(representation,DataItem)}} of `DISCRETE` becomes
        `PartCountDiscrete` \item A {{block(DataItem)}} with {{property(type)}}
        `VARIABLE` and {{property(representation,DataItem)}} of `DATA_SET`
        becomes `VariableDataSet` \item A {{block(DataItem)}} with
        {{property(type)}} `WORK_OFFSET` and
        {{property(representation,DataItem)}} of `TABLE` becomes
        `WorkOffsetTable` \end{itemize} The following constraints apply to each
        {{property(representation,DataItem)}}: \begin{itemize} \item A
        {{block(DataItem)}} with {{property(representation,DataItem)}}
        `TIME_SERIES` **MUST** have a {{property(category,DataItem)}} `SAMPLE`
        \item \DEPRECATED A {{block(DataItem)}} with
        {{property(representation,DataItem)}} `DISCRETE` **MUST** have a
        {{property(category,DataItem)}} `EVENT` \item A {{block(DataItem)}} with
        {{property(representation,DataItem)}} `DATA_SET` **MUST** have a
        {{property(category,DataItem)}} `EVENT` or `SAMPLE` \item A
        {{block(DataItem)}} with {{property(representation,DataItem)}} `TABLE`
        **MUST** have a {{property(category,DataItem)}} `EVENT` or `SAMPLE`
        \end{itemize} The following sections provide semantic information for
        the {{block(Representation)}} model. !Representation.png! Note: See
        {{sect(Representation Schema Diagrams)}} for XML schema.
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='TIME_SERIES'>
        <xs:annotation>
          <xs:documentation>
            A series of sampled data. The data is reported for a specified
            number of samples and each sample is reported with a fixed period.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='VALUE'>
        <xs:annotation>
          <xs:documentation>
            The measured value of the sample data. If no
            {{property(representation,DataItem)}} is specified for a data item,
            the {{property(representation,DataItem)}} **MUST** be determined to
            be `VALUE`.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DATA_SET'>
        <xs:annotation>
          <xs:documentation>
            The reported value(s) are represented as a set of
            {{termplural(key-value pair)}}. Each reported value in the
            {{term(Data Set)}} **MUST** have a unique key.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='DISCRETE'>
        <xs:annotation>
          <xs:documentation>
            **DEPRECATED** as a {{property(representation)}} in *MTConnect
            Version. 1.5*. Replaced by the {{property(discrete,DataItem)}}
            attribute of a {{block(DataItem)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='TABLE'>
        <xs:annotation>
          <xs:documentation>
            A {{term(Table)}} is a two dimensional set of {{termplural(key-value
            pair)}} where the {{block(Entry)}} represents a row, and the value
            is a set of {{term(key-value pair)}} {{block(Cell)}} elements. The
            {{term(Table)}} follows the same behavior as the {{term(Data Set)}}
            for change tracking, clearing, and history. When an {{block(Entry)}}
            changes, all {{block(Cell)}} elements update as a single unit
            following the behavior of a {{term(Data Set)}}. Note 1 to Entry: It
            is best to use the {{block(Variable)}} {{block(DataItem)}}
            {{property(type)}} if the {{block(Cell)}} elements represent
            multiple semantic types. Each {{block(Entry)}} in the
            {{term(Table)}} **MUST** have a unique key. Each {{block(Cell)}} of
            each {{block(Entry)}} in the {{term(Table)}} **MUST** have a unique
            key. See {{cite(Section 5.6.5)}} of {{citetitle(MTCPart3)}}, for a
            description of {{block(Entry)}} and {{block(Cell)}} elements.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name='DataItemFilterEnumType'>
    <xs:annotation>
      <xs:documentation>
        The type of filter
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='MINIMUM_DELTA'>
        <xs:annotation>
          <xs:documentation>
            For a `MINIMUM_DELTA` type {{block(Filter)}}, a new value **MUST
            NOT** be reported for a data item unless the measured value has
            changed from the last reported value by at least the delta given as
            the value of this element. The value of {{block(Filter)}} **MUST**
            be an absolute value using the same units as the reported data.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='PERIOD'>
        <xs:annotation>
          <xs:documentation>
            For a `PERIOD` type {{block(Filter)}}, the data reported for a data
            item is provided on a periodic basis. The `PERIOD` for reporting
            data is defined in the value of the {{block(Filter)}}. The value of
            {{block(Filter)}} **MUST** be an absolute value reported in seconds
            representing the time between reported samples of the value of the
            data item.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='DataItemsType'>
    <xs:annotation>
      <xs:documentation/>
    </xs:annotation>
    <xs:all>
      <xs:element name='DataItem' type='DataItemType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            {{block(DataItem)}} describes a piece of information reported about
            a piece of equipment.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='DataItemType'>
    <xs:annotation>
      <xs:documentation>
        {{block(DataItem)}} describes a piece of information reported about a
        piece of equipment.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Source' type='DataItemSourceType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Source)}} identifies the {{block(Component)}},
            {{block(DataItem)}}, or {{block(Composition)}} representing the area
            of the piece of equipment from which a measured value originates.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Constraints' type='DataItemConstraintsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Constraints)}} {{termplural(organize)}} a set of expected
            values that can be reported for this {{block(DataItem)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Filters' type='FiltersType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Filters)}} {{termplural(organize)}} the {{block(Filter)}}
            elements associated with this {{block(DataItem)}} element. 
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='InitialValue' type='DataItemNumericValueType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(InitialValue)}} defines the starting value for a data item
            as well as the value to be set for the data item after a reset
            event.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='ResetTrigger' type='DataItemResetValueType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(ResetTrigger)}} identifies the type of event that may cause
            a reset to occur.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Definition' type='DataItemDefinitionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Definition)}} defines the meaning of {{block(Entry)}}
            and {{block(Cell)}} elements associated with the {{block(DataItem)}}
            when the {{property(representation)}} is either {{block(DATA)}} or
            {{block(TABLE)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='Relationships' type='DataItemRelationshipsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(Relationships)}} {{termplural(organize)}} one or more
            {{block(DataItemRelationship)}} and
            {{block(SpecificationRelationship)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attribute name='name' type='NameType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional implementors name of the measurement.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='id' type='IDType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The unique identifier for this element.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='DataItemEnumType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The type of measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='subType' type='DataItemSubEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The sub type for the measurement
        </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='units' type='UnitsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The units of the measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='nativeUnits' type='NativeUnitsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The units as expressed by the machine
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='nativeScale' type='NativeScaleType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The units as expressed by the machine
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='category' type='CategoryType' use='required'>
      <xs:annotation>
        <xs:documentation>
          The category of the data item
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='coordinateSystem' type='CoordinateSystemEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          A {{block(CoordinateSystem)}} is a reference system that associates a
          unique set of n parameters with each point in an n-dimensional space.
          {{cite(Ref: ISO 10303-218:2004)}}
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='coordinateSystemIdRef' type='CoordinateSystemIdRefType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The coordinate system reference to a particular coordinate system
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='compositionId' type='CompositionIdType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The optional composition identifier
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='sampleRate' type='DataItemSampleRateType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          Used as the default sample rate for waveforms
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='representation' type='RepresentationType' use='optional' default='VALUE'>
      <xs:annotation>
        <xs:documentation>
          A {{property(representation,DataItem)}} specifies the format and
          structure of the information for an {{term(observation)}}. The default
          {{property(representation,DataItem)}} is `VALUE` indicating the format
          as specified in {{citetitle(MTCPart3)}}. A
          {{property(representation,DataItem)}}, other than `VALUE`, will modify
          the element name of the {{term(observation)}} by appending the pascal
          case of the {{property(representation,DataItem)}} as follows:
          \begin{itemize} \item A {{block(DataItem)}} with {{property(type)}}
          `TEMPERATURE` and {{property(representation,DataItem)}} of
          `TIME_SERIES` becomes `TemperatureTimeSeries` \item **DEPRECATED** A
          {{block(DataItem)}} with {{property(type)}} `PART_COUNT` and
          {{property(representation,DataItem)}} of `DISCRETE` becomes
          `PartCountDiscrete` \item A {{block(DataItem)}} with
          {{property(type)}} `VARIABLE` and
          {{property(representation,DataItem)}} of `DATA_SET` becomes
          `VariableDataSet` \item A {{block(DataItem)}} with {{property(type)}}
          `WORK_OFFSET` and {{property(representation,DataItem)}} of `TABLE`
          becomes `WorkOffsetTable` \end{itemize} The following constraints
          apply to each {{property(representation,DataItem)}}: \begin{itemize}
          \item A {{block(DataItem)}} with {{property(representation,DataItem)}}
          `TIME_SERIES` **MUST** have a {{property(category,DataItem)}} `SAMPLE`
          \item \DEPRECATED A {{block(DataItem)}} with
          {{property(representation,DataItem)}} `DISCRETE` **MUST** have a
          {{property(category,DataItem)}} `EVENT` \item A {{block(DataItem)}}
          with {{property(representation,DataItem)}} `DATA_SET` **MUST** have a
          {{property(category,DataItem)}} `EVENT` or `SAMPLE` \item A
          {{block(DataItem)}} with {{property(representation,DataItem)}} `TABLE`
          **MUST** have a {{property(category,DataItem)}} `EVENT` or `SAMPLE`
          \end{itemize} The following sections provide semantic information for
          the {{block(Representation)}} model. !Representation.png! Note: See
          {{sect(Representation Schema Diagrams)}} for XML schema.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='significantDigits' type='SignificantDigitsValueType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The number of significant digits for this data item
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='discrete' type='DiscreteType' use='optional' default='false'>
      <xs:annotation>
        <xs:documentation>
          *MTConnect Version 1.5* replaced {{property(representation)}}
          `DISCRETE` with a {{property(discrete)}} attribute for
          {{block(DataItem)}}. `DISCRETE` \MUST only be used with a
          {{block(DataItem)}} with a {{property(category)}} of `EVENT`. Each
          occurrence of the {{term(observation)}} **MAY** have the same value as
          the previous occurrence, and **MUST NOT** suppress duplicates.
          Examples of `DISCRETE` information as follows: A `PartCount` reporting
          the completion of each part using a 1 to indicate completion of a
          single part, a `Message` that occurs each time a door opens. 
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:complexType name='DataItemConstraintsType'>
    <xs:annotation>
      <xs:documentation>
        A set of limits for a data item
      </xs:documentation>
    </xs:annotation>
    <xs:sequence>
      <xs:choice minOccurs='0' maxOccurs='1'>
        <xs:sequence minOccurs='1'>
          <xs:element name='Value' type='DataItemValueElementType' minOccurs='1' maxOccurs='unbounded'>
            <xs:annotation>
              <xs:documentation>
                {{property(Value)}} represents a single data value that is
                expected to be reported for a {{block(DataItem)}} element.
                {{property(Value)}} **MUST NOT** be used in conjunction with any
                other {{block(Constraint)}} elements.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
        <xs:sequence minOccurs='1'>
          <xs:element name='Minimum' type='DataItemNumericValueType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                If the data reported for a data item is a range of numeric
                values, the expected value reported **MAY** be described with a
                lower limit defined by this constraint.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Maximum' type='DataItemNumericValueType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                If the data reported for a data item is a range of numeric
                values, the expected value reported **MAY** be described with an
                upper limit defined by this constraint.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element name='Nominal' type='DataItemNumericValueType' minOccurs='0' maxOccurs='1'>
            <xs:annotation>
              <xs:documentation>
                The target or expected value for this data item.
              </xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:sequence>
      </xs:choice>
      <xs:element name='Filter' type='DataItemFilterType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            Any substance or structure through which liquids or gases are passed
            to remove suspended impurities or to recover solids.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:sequence>
  </xs:complexType>
  <xs:complexType name='FiltersType'>
    <xs:annotation>
      <xs:documentation>
        {{block(Filters)}} {{termplural(organize)}} the {{block(Filter)}}
        elements associated with this {{block(DataItem)}} element. 
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Filter' type='DataItemFilterType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            Any substance or structure through which liquids or gases are passed
            to remove suspended impurities or to recover solids.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='DataItemBaseType'>
    <xs:annotation>
      <xs:documentation>
        A starting point for a data item
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='DataItemValueType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='DataItemValueElementType'>
    <xs:annotation>
      <xs:documentation>
        The value element
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='DataItemOptionType'/>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='DataItemFilterType'>
    <xs:annotation>
      <xs:documentation>
        The filter for the data item
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='FilterValueType'>
        <xs:attribute name='type' type='DataItemFilterEnumType' use='required'>
          <xs:annotation>
            <xs:documentation>
              The type of filter, ABSOLUTE or PERCENT
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='DataItemSourceType'>
    <xs:annotation>
      <xs:documentation>
        A native data source
      </xs:documentation>
    </xs:annotation>
    <xs:simpleContent>
      <xs:extension base='ItemSourceType'>
        <xs:attribute name='dataItemId' type='SourceDataItemIdType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The optional data item within the source component that provides
              the underlying data
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='componentId' type='SourceComponentIdType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The component that is collecting the data associated with this
              data item
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
        <xs:attribute name='compositionId' type='CompositionIdType' use='optional'>
          <xs:annotation>
            <xs:documentation>
              The optional composition identifier for the source of this data
              item
            </xs:documentation>
          </xs:annotation>
        </xs:attribute>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:complexType name='DataItemDefinitionType'>
    <xs:annotation>
      <xs:documentation>
        The DataItem Definition
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='DataItemDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='EntryDefinitions' type='EntryDefinitionsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(EntryDefinitions)}} {{termplural(organize)}}
            {{block(EntryDefinition)}} elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='CellDefinitions' type='CellDefinitionsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(CellDefinitions)}} {{termplural(organize)}}
            {{block(CellDefinition)}} elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='EntryDefinitionsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(EntryDefinitions)}} {{termplural(organize)}}
        {{block(EntryDefinition)}} elements.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='EntryDefinition' type='EntryDefinitionType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            The semantic definition of an {{block(Entry)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:attributeGroup name='DefinitionAttrsType'>
    <xs:attribute name='key' type='KeyType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          unique key
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='type' type='DataItemEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The type of measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='keyType' type='DataItemEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The type of measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='subType' type='DataItemSubEnumType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The sub type for the measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='units' type='UnitsType' use='optional'>
      <xs:annotation>
        <xs:documentation>
          The units of the measurement
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:attributeGroup>
  <xs:complexType name='EntryDefinitionType'>
    <xs:annotation>
      <xs:documentation>
        The semantic definition of an {{block(Entry)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='DataItemDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
      <xs:element name='CellDefinitions' type='CellDefinitionsType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            {{block(CellDefinitions)}} {{termplural(organize)}}
            {{block(CellDefinition)}} elements.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attributeGroup ref='DefinitionAttrsType'/>
  </xs:complexType>
  <xs:complexType name='CellDefinitionsType'>
    <xs:annotation>
      <xs:documentation>
        {{block(CellDefinitions)}} {{termplural(organize)}}
        {{block(CellDefinition)}} elements.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='CellDefinition' type='CellDefinitionType' minOccurs='1' maxOccurs='unbounded'>
        <xs:annotation>
          <xs:documentation>
            The semantic definition of a {{block(Cell)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='CellDefinitionType'>
    <xs:annotation>
      <xs:documentation>
        The semantic definition of a {{block(Cell)}}.
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element name='Description' type='DataItemDescriptionType' minOccurs='0' maxOccurs='1'>
        <xs:annotation>
          <xs:documentation>
            The {{block(Description)}} of the {{block(Definition)}}. See
            {{block(Component)}} {{block(Description)}}.
          </xs:documentation>
        </xs:annotation>
      </xs:element>
    </xs:all>
    <xs:attributeGroup ref='DefinitionAttrsType'/>
  </xs:complexType>
  <xs:complexType name='DataItemRelationshipsType'>
    <xs:annotation>
      <xs:documentation>
        Organizes DataItemRelationship and SpecificationRelationship
      </xs:documentation>
    </xs:annotation>
    <xs:all>
      <xs:element ref='AbstractDataItemRelationship' minOccurs='1' maxOccurs='unbounded'/>
    </xs:all>
  </xs:complexType>
  <xs:complexType name='AbstractDataItemRelationshipType' abstract='true'>
    <xs:annotation>
      <xs:documentation>
        Common base for data item relationship
      </xs:documentation>
    </xs:annotation>
    <xs:attribute name='name' type='NameType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A descriptive name associated with this Relationship
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
    <xs:attribute name='idRef' type='ReferenceIdType' use='required'>
      <xs:annotation>
        <xs:documentation>
          A reference to the related DataItem id.
        </xs:documentation>
      </xs:annotation>
    </xs:attribute>
  </xs:complexType>
  <xs:element abstract='true' name='AbstractDataItemRelationship' type='AbstractDataItemRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        Common base for data item relationship
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='DataItemRelationshipTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        How the data items are related
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='ATTACHMENT'>
        <xs:annotation>
          <xs:documentation>
            A reference to a DataItem that associates the values with an
            external entity
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='COORDINATE_SYSTEM'>
        <xs:annotation>
          <xs:documentation>
            The referenced DataItem provides the id of the effective Coordinate
            System
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='LIMIT'>
        <xs:annotation>
          <xs:documentation>
            The referenced DataItem provides process limits.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value='OBSERVATION'>
        <xs:annotation>
          <xs:documentation>
            The referenced DataItem provides the observed values.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='DataItemRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Relationship)}} providing a semantic reference to another
        {{block(DataItem)}} described by the {{property(type)}} property.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractDataItemRelationshipType'>
        <xs:attribute name='type' type='DataItemRelationshipTypeEnumType' 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:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='DataItemRelationship' type='DataItemRelationshipType' substitutionGroup='AbstractDataItemRelationship'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Relationship)}} providing a semantic reference to another
        {{block(DataItem)}} described by the {{property(type)}} property.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
  <xs:simpleType name='SpecificationRelationshipTypeEnumType'>
    <xs:annotation>
      <xs:documentation>
        How the data items are related
      </xs:documentation>
    </xs:annotation>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='LIMIT'>
        <xs:annotation>
          <xs:documentation>
            The referenced DataItem provides process limits.
          </xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
  <xs:complexType name='SpecificationRelationshipType'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Relationship)}} providing a semantic reference to another
        {{block(Specification)}} described by the {{property(type)}} and
        {{property(idRef)}} property.
      </xs:documentation>
    </xs:annotation>
    <xs:complexContent>
      <xs:extension base='AbstractDataItemRelationshipType'>
        <xs:attribute name='type' type='SpecificationRelationshipTypeEnumType' 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:extension>
    </xs:complexContent>
  </xs:complexType>
  <xs:element name='SpecificationRelationship' type='SpecificationRelationshipType' substitutionGroup='AbstractDataItemRelationship'>
    <xs:annotation>
      <xs:documentation>
        A {{block(Relationship)}} providing a semantic reference to another
        {{block(Specification)}} described by the {{property(type)}} and
        {{property(idRef)}} property.
      </xs:documentation>
    </xs:annotation>
  </xs:element>
</xs:schema>