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If the AcceptEventAction has no incoming edges, by the usual rules, it is enabled when its immediately containing Activity (or StructuredActivityNode) begins execution.

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Source
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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SEMANTIC
UML keywords
AcceptEventAction
Activity
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If an AcceptEventAction is used in an Activity, there are special rules for when it is enabled ..
Full quote
If the AcceptEventAction has no incoming edges, by the usual rules, it is enabled when its immediately containing Activity (or StructuredActivityNode) begins execution.
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However, in addition, an AcceptEventAction with no incoming edges remains enabled after it accepts an Event occurrence.
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That is, it does not terminate after accepting an Event occurrence and outputting any values (as described above), but continues to wait for another Event occurrence.
Such an AcceptEventAction is terminated when its immediately containing Activity (or StructuredActivityNode) is terminated.
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