BPEL Is a web service Sequencing Language 区 Process defines“ conversation"flow chart Conversation consists of only WSDL-described message exchanges Process instance is a particular conversation following the chart EXecution systems can support multiple concurrent conversationsBPEL Is a Web Service Sequencing Language Process defines “conversation” flow chart – Conversation consists of only WSDL-described message exchanges. Process instance is a particular conversation following the chart – Execution systems can support multiple concurrent conversations