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Addressing
For messages to be routed and services to be addressed in this multitransport messaging environment, a common addressing mechanism is required. The WS-Addressing specification defines the model and syntax for a routing and addressing message information header. The message information header for addressing is described in terms of its Infoset. A SOAP binding is also defined. When using the SOAP binding, message addressing is done with SOAP header blocks. Addressing information is assumed to be immutable. SOAP intermediaries may not modify addressing information along the message path.WS-Addressing also introduces the concept of endpoint references. Endpoint references logically extend, but do not replace, the WSDL description model. They enable an extensible addressing approach well integrated with the SOAP processing model. The key elements of WS-Addressing are described in this section.Chapter 3, "Metadata."Two examples of reference parameter use are infrastructural and application-level. An infrastructural example of a reference parameter can be a transaction/enlistment ID sent to a Transaction Processing monitor. In a book-purchase scenario, the ISBN number of a book can be an application-level example of a reference parameter.
