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An ObjectNode may contain multiple object tokens with the same value. Such tokens are not normally combined (but see the special semantics for DataStoreNodes ...).

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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
ObjectNode
token
object token
DataStoreNode
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An ObjectNode may contain multiple object tokens with the same value. Such tokens are not normally combined (but see the special semantics for DataStoreNodes ...)
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If the number of tokens already held by the ObjectNode is greater than or equal to the evaluated upperBound, then the ObjectNode shall not accept any further tokens until some of the ones it is holding are removed.
Related snippets
15.4.3.1 Object Nodes - An ObjectNode holds object tokens during the course of the execution of an Activity.
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