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If an accept signal action has isUnmarshall=false, then it must have a single result OutputPin on which the Signal instance associated with an accepted SignalEvent occurrence is placed.

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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
UML keywords
AcceptEventAction
accept signal action
AcceptEventAction::isUnmarshall
OutputPin
Trigger
SignalEvent
Signal
An AcceptEventAction with a trigger for a SignalEvent is informally called an accept signal action.
Full quote
If an accept signal action has isUnmarshall=false, then it must have a single result OutputPin on which the Signal instance associated with an accepted SignalEvent occurrence is placed.
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If it has isUnmarshall=true, then it must have result OutputPins corresponding to each of the attributes of the Signal of the SignalEvent (in order), and the attribute values of the Signal instance associated with an accepted SignalEvent occurrence ...
Related snippets
AcceptEventAction is an Action with Triggers for one or more Events. When an AcceptEventAction is executed, it waits for an Event occurrence to be dispatched from the event pool of the context object for its execution that matches one of its Triggers.
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