Simple Object Access Protocol(SOAP)

SOAP, or the Simple Object Access Protocol is a protocol used in computing. Web services use this protocol to communicate. SOAP uses XML to encode a message. It uses other application-layer protocols, for transport, and content negotiation, for example HTTP and Remote Procedure Call. The most common combination is to use SOAP with HTTP and TCP. There are different versions, 1.0, 1.1, and 1.2. Since version 1.2 the protocol is simply called SOAP. This is because the protocol is not simple, and that it can be used for other purposes than accessing objects.Continue Reading…

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Learn Simple Object Access Protocol Online

http://msdn.microsoft.com/en-us/library/ms995800.aspx
http://www.w3schools.com/webservices/ws_soap_intro.asp
http://www.tutorialspoint.com/soap/