The XINS introduction presentation (PDF) provides an introduction to frameworks in general and to XINS in particular.
Framework
RPC
xins
Name of the RPC protocol integrated within XINS, previously called “REST-RPC”. Since the name “REST-RPC” is considered confusing, it has been changed. The XINS-internal name for this protocol used to be “the XINS standard calling convention.” POX-RPC intends to offer the simplicity of XML-RPC, combined with improved features, including browser-compatibility.
“POX” stands for “Plain Old XML” while “RPC” stands for “Remote Procedure Calls.”
Recently, a SourceForge project has been created to host the POX-RPC definition formats and documentation: SourceForge project.