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DecisionNode::incoming_outgoing_edges A DecisionNode has one or two incoming ActivityEdges and at least one outgoing ActivityEdge.

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Figure 11-12: Continuous system example 3 {EXPLICIT PINS}
OR with DecisionNode and MergeNode
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
CONSTRAINT
UML keywords
DecisionNode
ActivityEdge
ActivityNode::incoming
ActivityNode::outgoing
Full quote
incoming_outgoing_edges

A DecisionNode has one or two incoming ActivityEdges and at least one outgoing ActivityEdge. 


       inv: (incoming->size() = 1 or incoming->size() = 2) and outgoing->size() > 0
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Related snippets
A DecisionNode is a ControlNode that chooses between outgoing ActivityEdges for the routing of tokens.
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.
DecisionNode::edges The ActivityEdges incoming to and outgoing from a DecisionNode, other than the decisionInputFlow (if any), must be either all ObjectFlows or all ControlFlows.
Related snippets (backlinks)
incoming_control_one_input_parameter If the DecisionNode has a decisionInputFlow and an incoming ControlFlow, then any decisionInput Behavior has one in Parameter ...
A DecisionNode shall have at least one and at most two incoming ActivityEdges, and at least one outgoing ActivityEdge.
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