Simple Object Access Protocol (SOAP) is an XML-based protocol that allows programs running on heterogeneous hardware and software in a distributed environment to exchange data with each other, and to do remote procedure calls (RPC). All communication in the Web services architecture is done via SOAP.
At the time of this writing, both SOAP 1.1 and SOAP with Attachments specifications have been submitted to the W3C as Notes. You can access the SOAP 1.1 specification at http://www.w3.org/TR/SOAP/.
The SOAP with Attachments Note can be accessed at http://www.w3.org/TR/SOAP-attachments.
Although the SOAP 1.1 and SOAP with Attachments specifications are submitted with the W3C as Notes, a Working Draft on SOAP 1.2 has also been submitted. ...