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decisionInput : Behavior [0..1] ... A Behavior that is executed to provide an input to guard ValueSpecifications on ActivityEdges outgoing from the DecisionNode.

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UML/SysML: Cameo Simulation Toolkit 19SP3: A parent Activity with a DecisionNode that uses a Activity as a decisionInput Behavior terminates immediately after the decisionInput terminates (but OpaqueBehavior works)
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
Snippet kind
INFO
UML keywords
DecisionNode
DecisionNode::decisionInput
ControlNode
ActivityEdge
Behavior
ValueSpecification
ActivityEdge::guard
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decisionInput : Behavior [0..1] (opposite A_decisionInput_decisionNode::decisionNode)

A Behavior that is executed to provide an input to guard ValueSpecifications on ActivityEdges outgoing from the DecisionNode.

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A DecisionNode is a ControlNode that chooses between outgoing ActivityEdges for the routing of tokens.
Related snippets (backlinks)
decisionInputFlow : ObjectFlow [0..1] ... An additional ActivityEdge incoming to the DecisionNode that provides a decision input value for the guards ValueSpecifications on ActivityEdges outgoing from the DecisionNode.
zero_input_parameters If the DecisionNode has no decisionInputFlow and an incoming ControlFlow, then any decisionInput Behavior has no in parameters.
two_input_parameters If the DecisionNode has a decisionInputFlow and a second incoming ObjectFlow, then any decisionInput has two in Parameters ...
incoming_control_one_input_parameter If the DecisionNode has a decisionInputFlow and an incoming ControlFlow, then any decisionInput Behavior has one in Parameter ...
A decisionInput Behavior has no out parameters, no inout parameters, and one return parameter.
If a DecisionNode has a decisionInputFlow, then a token must be offered on both the primary incoming edge and the decisionInputFlow before the token from the primary incoming edge is offered to the outgoing edges.
If the DecisionNode does not have a decisionInput, then the value contained in the object token on the decisionInputFlow is made available to the guards on each outgoing edge, regardless of whether the primary incoming flow is a ControlFlow or an ObjectFl
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