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A Trigger specifies a specific point at which an Event occurrence may trigger an effect in a Behavior.

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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
Snippet kind
INFO
UML keywords
Event
Behavior
Trigger
Event occurrence
Trigger::event
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A Trigger specifies a specific point at which an Event occurrence may trigger an effect in a Behavior.
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A Trigger may be qualified by the Port on which the Event occurred.
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trigger_with_ports: If a Trigger specifies one or more ports, the event of the Trigger must be a MessageEvent.
An Event is the specification of some occurrence that may potentially trigger effects by an object.
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.
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