The XML Protocol ("XMLP") is a standard being developed by the W3C XML Protocol Working Group to the following guidelines, outlined in the group's charter: 1. * An envelope for encapsulating XML data to be transferred in an interoperable manner that allows for distributed extensibility. 2. * A convention for the content of the envelope when used for RPC (Remote Procedure Call) applications. The protocol aspects of this should be coordinated closely with the IETF and make an effort to leverage any work they are doing, see below for details. 3. * A mechanism for serializing data representing non-syntactic data models such as object graphs and directed labeled graphs, based on the data types of XML Schema. 4. * A mechanism for using HTTP transport in the context of an XML Pr