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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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
ObjectNode
token
object token
ObjectNode::upperBound
ValueSpecification
UnlimitedNatural
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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 to or removed from the ObjectNode.
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15.4.3.1 Object Nodes - An ObjectNode holds object tokens during the course of the execution of an Activity.
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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.
If the upperBound evaluates to *, then there is no limit on the number of tokens the ObjectNode may hold.
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