Simple Object Access Protocol (SOAP) 1.2 - W3C Working Draft 9 July 2001. SOAP version 1.2 is a lightweight protocol for exchange of information in a decentralized, distributed environment. It is an XML based protocol. - http://www.w3.org/TR/soap12-part1/
SOAP Reference at Zvon - A complete reference which can be downloaded for off-line use. - http://www.zvon.org/xxl/soapReference/Output/
XML Protocol (XMLP) Requirements - Describes the XML Protocol Working Group's requirements for the XML Protocol (XMLP) specification. - http://www.w3.org/TR/xmlp-reqs