Web Services Platform Architecture [Electronic resources] : SOAP, WSDL, WS-Policy, WS-Addressing, WS-BPEL, WS-Reliable Messaging, and More نسخه متنی

4.4. Differences Between SOAP 1.1 and 1.2

The Part 1, describes the core SOAP specification as a messaging framework. Part 1 describes the SOAP message in terms of the XML Infoset, together with its associated processing model. The use of the XML Infoset in describing the SOAP message allows the message structure to be documented without referring to its serialization. The messaging framework also describes SOAP's extensibility with a framework that allows SOAP bindings to be described to different underlying network protocols.

The third document, Part 2, contains the remainder of the specification as a set of optional features. This includes a description of a data model and encoding mechanism in addition to patterns for SOAP's use for RPC. The document then describes mechanisms for extending SOAP with further features and a framework for binding to network protocols. The core SOAP specification describes a one-way message, which is why the third part also includes descriptions of how to combine the one-way message into more complex message exchange patterns, such as request/reply. Finally, Part 2 includes a binding to HTTP as an example of a request/reply pattern.

This restructuring emphasizes the flexibility of SOAP and is intended to solve the perceived restrictions of the SOAP 1.1 specifications. For a detailed listing of the differences between SOAP 1.1 and 1.2, review section 6 of the SOAP 1.2 primer [SOAP 1.2 Part 0].