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Central Buffer Node
Description
A Central Buffer Node is an object node for managing flows from multiple sources and destinations, represented in an Activity diagram. It acts as a buffer for multiple in-flows and out-flows from other object nodes, but does not connect directly to Actions.
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OMG UML Specification:
The OMG UML specification (UML Superstructure Specification, v2.1.1, p.352) states:
A central buffer node is an object node for managing flows from multiple sources and destinations. ... A central buffer node accepts tokens from upstream object nodes and passes them along to downstream object nodes.