Document, RPC, Literal, Encoded
Much of the confusion in understanding SOAP comes from the fact that several of the key terms are overloaded. For example, both SOAP RPC (meaning the convention for performing remote procedure calls via SOAP) and RPC style are both valid pieces of SOAP terminology. In this section we clarify the meaning of each of these terms so they do not cause further confusion as we begin discussing WSDL.
Document
Document-style SOAP refers to the way in which the application payload is hosted within the SOAP Body element. When we use document style, it means the document is placed directly as a child of the Body element, as shown on the left in Figure 3-22, where the application content is a direct child of the <soap:Body> ...
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