To call the service from BPEL, you use the BPEL file to define how the process interfaces with the web service. View the partnerLinks section. The services with which a process interacts are designed as partner links. Each partner link is characterized by a partnerLinkType.

Each partner link is named. This name is used for all service interactions through that partner link. This is critical in correlating responses to different partner links for simultaneous requests of the same type.

Asynchronous processes use a second partner link for the callback to the client. In this example, the second partner link, LoanService, is used by the loan application approver web service. The following provides an example.

  <!-- This process invokes the asynchronous LoanService. -->

    <partnerLink name="LoanService"
             partnerLinkType="services:LoanService"
             myRole="LoanServiceRequester"
             partnerRole="LoanServiceProvider"/>
  </partnerLinks>

The attribute myRole indicates the role of the client. The attribute partnerRole role indicates the role of the partner in this conversation. Each partnerLinkType has myRole and partnerRole attributes in asynchronous processes.