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A MessageEvent specifies the receipt by an object of either an Operation call or a Signal instance.

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SysMLv1: CAUTION: Only a Signal can be used for a SendSignalAction or MessageEvent trigger of an AcceptEventAction, not a Block or ValueType, even if they are valid types for a SysML FlowProperty! But you can "wrap" a Block or ValueType in a Signal.
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
MessageEvent
object
Operation
Signal
CallEvent
SignalEvent
AnyReceiveEvent
Full quote
A MessageEvent specifies the receipt by an object of either an Operation call or a Signal instance.
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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.
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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