The event that enables this trigger is called a completion event and it signifies that all Behaviors associated with the source State of the completion Transition have completed execution.

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Completion transitions and implicit triggers
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Unified Modeling Language 2.5.1
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
UML keywords
StateMachine
State
completion
completion transition
implicit trigger
Transition
Trigger
completion event
Trigger::event
14.2.3.8.3 Completion Transitions and completion events: A special kind of Transition is a completion Transition, which has an implicit trigger.
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The event that enables this trigger is called a completion event and it signifies that all Behaviors associated with the source State of the completion Transition have completed execution.
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In case of simple States, a completion event is generated when the associated entry and doActivity Behaviors have completed executing. If no such Behaviors are defined, the completion event is generated upon entry into the State.
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14.2.3.8.3 Completion Transitions and completion events: A special kind of Transition is a completion Transition, which has an implicit trigger.
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In case of simple States, a completion event is generated when the associated entry and doActivity Behaviors have completed executing. If no such Behaviors are defined, the completion event is generated upon entry into the State.
Completion events have dispatching priority. That is, they are dispatched ahead of any pending Event occurrences in the event pool.
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