A Port has the ability, by setting the property isBehavior to true, to specify that any requests arriving at this Port are handled by the Behavior of the instance of the owning EncapsulatedClassifier, rather than being forwarded to any contained instances

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Boundary Ports and kinds of Connectors
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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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Port::isBehavior
Port
Behavior
EncapsulatedClassifier
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A Port has the ability, by setting the property isBehavior to true, to specify that any requests arriving at this Port are handled by the Behavior of the instance of the owning EncapsulatedClassifier, rather than being forwarded to any contained instances, if any.
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Such a Port is called a behavior Port. If there is no Behavior defined for this EncapsulatedClassifier, any communication arriving at a behavior Port is lost.
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Such a Port is called a behavior Port. If there is no Behavior defined for this EncapsulatedClassifier, any communication arriving at a behavior Port is lost.
A delegation Connector is a Connector that links a Port to a role within the owning EncapsulatedClassifier. It represents the forwarding of requests (Operation invocations and Signals).
A request that arrives at a Port that has a delegation Connector to one or more Properties or Ports on Properties will be passed on to those targets for handling.
Delegation Connectors can be used to model the hierarchical decomposition of behavior, where services provided by an EncapsulatedClassifier may ultimately be realized by one that is nested multiple levels deep within it.
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