Steve Ross-Talbot; Tony Fletcher. <a href="http://www.w3.org/TR/2006/WD-ws-cdl-10-primer-20060619"><cite>Web Services Choreography Description Language: Primer.</cite></a> 19 June 2006. W3C Working Draft. (Work in progress.) URL: <a href="http://www.w3.org/TR/2006/WD-ws-cdl-10-primer-20060619">http://www.w3.org/TR/2006/WD-ws-cdl-10-primer-20060619</a>