This figure shows an example of a parallel flow operation for the United Loan and Star Loan Web services. Within the BPEL process is a flow that contains two sequences, one for United Loan and the other for Star Loan. In each sequence is an invoke activity to initiate the service and a receive activity to wait for the callback. Outside the BPEL process is the United Loan Web service and its accompanying WSDL, and the Star Loan Web service and its accompanying WSDL.