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If the upperBound evaluates to *, then there is no limit on the number of tokens the ObjectNode may hold.

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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
Snippet kind
INFO
UML keywords
Activity
ObjectNode
token
object token
ObjectNode::upperBound
ValueSpecification
UnlimitedNatural
*
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If the removal of one or more tokens brings the number of tokens held below the evaluated upperBound, then the ObjectNode may accept any pending offers up to the limit of the upperBound.
Full quote
If the upperBound evaluates to *, then there is no limit on the number of tokens the ObjectNode may hold.
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15.4.3.1 Object Nodes - An ObjectNode holds object tokens during the course of the execution of an Activity.
An ObjectNode may not contain more tokens than specified by its upperBound, if any. If an ObjectNode has an upperBound, then this ValueSpecification shall evaluate to an UnlimitedNatural value. The upperBound is evaluated each time a token is offered ...
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