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 ...

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CatchDialN: Activity with AcceptEventAction for a SignalEvent and a CallBehaviorAction
Source
Unified Modeling Language 2.5.1
Copyright information
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
Classifier::attribute
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.
Full quote
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 are placed on these OutputPins.
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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.
An AcceptEventAction with a trigger for a SignalEvent is informally called an accept signal action.
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