Actions

Activity diagrams are flowcharts that decompose a system into activities that correspond to states. These diagrammatic elements, called actions, are member function calls within a given operation. In contrast to normal states (as in statecharts), actions in activity diagrams terminate on completion of the activity, rather than as a reaction to an externally generated event.

Each action can have an entry action, and must have at least one outgoing control flow. The implicit event trigger on the outgoing control flow is the completion of the entry action. If the action has several outgoing transitions, each must have its own guard condition.

Actions have the following constraints:


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