An OpaqueAction is an Action whose specification may be given in a textual concrete syntax other than UML. An OpaqueAction may also be used as a temporary placeholder before some other kind of Action is chosen.

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uml101 - Activity Diagram - notation - REFERENCE CARD
Activity example: send and catch Signal
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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
Activity Diagram
Activity
OpaqueAction
Action
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An OpaqueAction is an Action whose specification may be given in a textual concrete syntax other than UML. An OpaqueAction may also be used as a temporary placeholder before some other kind of Action is chosen.
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An OpaqueExpression specifies the computation of a set of values either in terms of a UML Behavior or based on a textual statement in a language other than UML.
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