When an offer for an object token held by a DataStoreNode is accepted by a downstream object node, the offered token is removed from the DataStoreNode, per the usual CentralBufferNode semantics. However, a copy is made of the removed object token ...

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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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Activity
CentralBufferNode
token
object token
DataStoreNode
token offer
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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When an offer for an object token held by a DataStoreNode is accepted by a downstream object node, the offered token is removed from the DataStoreNode, per the usual CentralBufferNode semantics. However, a copy is made of the removed object token, with the same value, and this is immediately placed back onto the DataStoreNode.
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... a copy is made of the removed object token, with the same value, and this is immediately placed back onto the DataStoreNode. Thus, the values held by a DataStoreNode appear to persist for the duration of each execution of its containing activity, even
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