http://docs.oasis-open.org/wsbpel/2.0/CS01/wsbpel-v2.0-CS01.htmlhttp://docs.oasis-open.org/wsbpel/2.0/CS01/wsbpel-v2.0-CS01.dochttp://docs.oasis-open.org/wsbpel/2.0/CS01/wsbpel-v2.0-CS01.pdf