The W3C Web Services Choreography Working Group has posted the first working draft of Web Services Choreography Description Language: Primer. "This primer is intended to give an overview of WS-CDL and can be read by WS-CDL users (e.g. a software professional wishing to write choreography descriptions) and WS-CDL implementers (e.g software professionals wishing to create WS-CDL compliant tools) alike."