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A Delegate Connector defines the internal assembly of a component's external Ports and Interfaces, on a Component diagram. Using a Delegate Connector wires the internal workings of the system to the outside world, by a delegation of the external interfaces' connections. 

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OMG UML Specification

The OMG UML specification (UML Superstructure Specification, v2.0, p. 143) states:

"A delegation connector is a connector that links the external contract of a component (as specified by its ports) to the internal realization of that behavior by the component's parts. It represents the forwarding of signals (operation requests and events) : a signal that arrives at a port that has a delegation connector to a part or to another port will be passed on to that target for handling."