An Activity shall have one ActivityParameterNode corresponding to each in, out, or return Parameter and two ActivityParameterNodes for each inout Parameter.

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Source
Unified Modeling Language 2.5.1
Copyright information
About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
Snippet kind
INFO
UML keywords
Activity
Behavior
Parameter
ActivityParameterNode
ActivityEdge
ParameterDirectionKind::in
ParameterDirectionKind::out
ParameterDirectionKind::inout
ParameterDirectionKind::return
Full quote
An Activity shall have one ActivityParameterNode corresponding to each in, out, or return Parameter and two ActivityParameterNodes for each inout Parameter.
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An in Parameter shall not be associated with an output ActivityParameterNode and an out or return Parameter shall not be associated with an input ActivityParameterNode (though either may be associated with an ActivityParameterNode that does not have ..
Related snippets
15.4.3.2 Activity Parameter Nodes - As a kind of Behavior, an Activity may have Parameters
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An Activity shall have ... two ActivityParameterNodes for each inout Parameter.
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