A MergeNode is a control node that brings together multiple flows without synchronization.

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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
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INFO
UML keywords
Activity
Activity Diagram
ControlNode
MergeNode
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A MergeNode is a control node that brings together multiple flows without synchronization.
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A MergeNode shall have exactly one outgoing ActivityEdge but may have multiple incoming ActivityEdges.
Related snippets
A DecisionNode is a ControlNode that chooses between outgoing ActivityEdges for the routing of tokens.
Related snippets (backlinks)
A MergeNode shall have exactly one outgoing ActivityEdge but may have multiple incoming ActivityEdges.
If the outgoing edge of a MergeNode is a ControlFlow, then all incoming edges must be ControlFlows, and, if the outgoing edge is an ObjectFlow, then all incoming edges must be ObjectFlows.
All tokens offered on the incoming edges of a MergeNode are offered to the outgoing edge. There is no synchronization of flows or joining of tokens.
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