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http://www.w3.org/TR/2005/CR-ws-cdl-10-20051109/
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http://docs.oasis-open.org/wsbpel/2.0/OS/wsbpel-v2.0-OS.html
3. Lecture Notes in Computer Science;M. Baldoni,2005
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5. Burdett, D., Kavantzas, N.: WS Choreography Model Overview,
http://www.w3.org/TR/ws-chor-model/