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What Does SOAP Define?

SOAP defines four basic pieces of information, which we will look at in turn:

SOAP does not define an object model or language bindings. It provides only the overall framework for an XML message to be communicated between a sender and a receiver, generically called SOAP processing nodes (Figure 4.3). A node may be a sender, a receiver, or both. This one-way message between nodes is often combined to implement request-response, asynchronous messaging, and notification type interactions. For example, a client may send a SOAP message within an HTTP request. The server processes that message and returns the SOAP response with the HTTP response.

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Figure 4.3: SOAP nodes

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