Nested activity diagrams

Many subactivities can start a single-nested activity diagram.

The nested activity diagram must have an initial (default) state and a final activity (see Local termination semantics). The outgoing control flows from a subactivity are enabled when the final activity of the nested activity diagram is reached (when the activity completes). Because states in activity diagrams do not have triggering events, subactivities are normally exited when their nested graph is finished.


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