The BPEL specification deals exclusively with orchestrating Web services, which naturally leads to the design pattern of wrapping user tasks as asynchronous Web services whose interface is published using a WSDL. A BPEL orchestration server can offer support for user tasks with a pre-built Web service component.
Thus, a user task component can be readily used by BPEL developers who need to integrate user tasks into their business flows. For more information see chapter 8 of the Collaxa BPEL Developer Guide.
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