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UML collaborative diagramare graphical representations of workflows of stepwise activities and actionswith support for choice, the iteration and concurrency. Collaborative diagramare intended to model both computational and organizational processes (i.e. workflows) in Unified Modeling Language. Collaborative diagramshow the overall flow of control.

UML collaborative diagramare constructed from a limited number of shapes, connected with arrows. Most important shape types:

  • rounded rectangles represent actions;
  • diamonds represent decisions;
  • bars represent the start (split) or end (join) of concurrent activities;
  • a black circle represents start (initial state) of the workflow;
  • encircled black circle can represents the end (final state).

Arrows run from start towards end and represent the order in which activities happen.

Hence they can be regarded as a form of flowchart. The typical flowchart techniques lack constructs for expressing concurrency. Join and split symbols in activity diagrams only resolve this for simple cases; the meaning of the model is not clear when they are arbitrarily combined with decisions or loops.

While in UML 1.x, activity diagrams were a specialized form of state diagrams, in UML 2.x, the activity diagrams were renormalized to be based on Petri net-like semantics, which increasing the scope of situations that can be modeled using activity diagrams. Such changes cause many UML 1.x UML collaborative diagramsto be interpreted differently in UML 2.x

UML collaborative diagram

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