8.5. SOAP Remote Procedure Call
One application that can be built on top of SOAP is remote procedure calling (RPC). In fact, it was one of the main motivations for the definition of SOAP. This section describes the RPC specification given in [SOAP] but others are possible.
An initial SOAP message indicates a procedure call request. The SOAP message then returned is the remote procedure response—presumably a return value or error indication.
8.5.1. SOAP HTTP Remote Procedure Call
Using SOAP for an RPC works independently of the transport used to carry and the encoding in use within the SOAP messages involved. However, it was anticipated that the SOAP encoding (see Section 8.3) and the HTTP protocol binding (Section 8.4) would be commonly used. ...
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