Support for Composite Structure Diagrams

[GEricson]

Please add support for composite structure diagrams, including support for UML Collaboration, and Collaboration Use.
Following UML 2.5.1 clause 11.7.4:
To facilitate inclusion of Properties and Connections, it is preferable to utilize a rectangular shape for <>.
CollaborationUse shapes are preferred to be ovals with dashed lines. The <> stereotype is optional. Each occurance of a collaborationUse should include its name, and the name of the Collaboration it represents)
Properties of the collaboration should be rectangular with solid lines and include the property name, type, and multiplicity.
Rolebindings should be dashed lines between properties and collaboration use symbols.