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An inout Parameter shall be associated with at most one input ActivityParameterNode and at most one output ActivityParameterNode.

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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
CONSTRAINT
UML keywords
Activity
Behavior
Parameter
ActivityParameterNode
ActivityEdge
ParameterDirectionKind::inout
Parameter::direction
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 ..
Full quote
An inout Parameter shall be associated with at most one input ActivityParameterNode and at most one output ActivityParameterNode.
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Related snippets
15.4.3.2 Activity Parameter Nodes - As a kind of Behavior, an Activity may have Parameters
An ActivityParameterNode shall have either all incoming or all outgoing ActivityEdges. An ActivityParameterNode with outgoing edges is an input ActivityParameterNode, while an ActivityParameterNode with incoming edges is an output ActivityParameterNode.
(Note that whether an ActivityParameterNode is for input or output is not determined until at least one ActivityEdge is connected to it.)
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