When the Activity is invoked, values may be passed into the Activity execution on input Parameters (i.e., those with direction in or inout) and values may be passed out .. on output Parameters (i.e., those with direction inout, out or return).

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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
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Activity
Behavior
Parameter
ActivityParameterNode
ParameterDirectionKind::in
ParameterDirectionKind::out
ParameterDirectionKind::inout
ParameterDirectionKind::return
Parameter::direction
execution
15.4.3.2 Activity Parameter Nodes - As a kind of Behavior, an Activity may have Parameters
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When the Activity is invoked, values may be passed into the Activity execution on input Parameters (i.e., those with direction in or inout) and values may be passed out of the Activity execution on output Parameters (i.e., those with direction inout, out or return).
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Within an Activity, inputs to and outputs from an Activity are handled using ActivityParameterNodes.
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