Unlike a regular CentralBufferNode, a DataStoreNode contains objects uniquely.

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SysMLv1: Cameo Simulation Toolkit: Activity Diagram simulation: Tokens in a DataStoreNode [with mini video]
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
CentralBufferNode
token
object token
DataStoreNode
token offer
When a DataStoreNode accepts an object token, if that token contains an object with the same identity as an object contained in a token already held by the node, then the duplicate object token shall not be placed on the DataStoreNode.
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Unlike a regular CentralBufferNode, a DataStoreNode contains objects uniquely.
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15.4.3.4 Data Store Nodes - A DataStoreNode is a CentralBufferNode that holds its object tokens persistently while its activity is executing.
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(Datastore already has an overwrite semantics)
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