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An Event is the specification of some occurrence that may potentially trigger effects by an object.

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UML Event types for triggering Transitions
uml101 - StateMachines - NOTATION REFERENCE CARD
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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INFO
UML keywords
Event
object
Event occurrence
Trigger
Trigger::event
Transition::trigger
ChangeEvent
MessageEvent
TimeEvent
Full quote
An Event is the specification of some occurrence that may potentially trigger effects by an object.
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Related snippets
A MessageEvent specifies the receipt by an object of either an Operation call or a Signal instance.
A Trigger specifies a specific point at which an Event occurrence may trigger an effect in a Behavior.
Related snippets (backlinks)
A ChangeEvent models a change in the system configuration that makes a condition true.
A TimeEvent is an Event that occurs at a specific point in time.
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 SignalEvent represents the receipt of an asynchronous Signal instance.
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