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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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SysMLv1: Cameo Simulation Toolkit: Activity Diagram simulation: Tokens in a DataStoreNode [with mini video]
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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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INFO
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Activity
CentralBufferNode
token
object token
DataStoreNode
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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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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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15.4.3.3 Central Buffer Nodes - A CentralBufferNode acts as a buffer between incoming ObjectFlows and outgoing ObjectFlows. It accepts all object tokens offered to it on all incoming flows, which are then held by the node.
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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
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.
Unlike a regular CentralBufferNode, a DataStoreNode contains objects uniquely.
The selection and transformation Behaviors on outgoing ObjectFlows can be used to get information out of a DataStoreNode as if a query were being performed.
(Datastore already has an overwrite semantics)
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