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A SignalEvent represents the receipt of an asynchronous Signal instance.

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UML Event types for triggering Transitions
uml101 - StateMachines - NOTATION REFERENCE CARD
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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
Event
MessageEvent
SignalEvent
Trigger
Trigger::event
Message
Operation
object
Signal
SignalEvent::signal
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A SignalEvent represents the receipt of an asynchronous Signal instance.
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An Event is the specification of some occurrence that may potentially trigger effects by an object.
A MessageEvent specifies the receipt by an object of either an Operation call or a Signal instance.
A trigger for an AnyReceiveEvent is triggered by the receipt of any message that is not explicitly handled by any related trigger.
A CallEvent models the receipt by an object of a message invoking a call of an Operation.
A TimeEvent is an Event that occurs at a specific point in time.
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