This image shows a SOA composite application. On the left side is the WebApp application. In the middle is a dashed box labeled Composite. The WebApp application connects the Composite BigBank using a service component called binding ws. The component used to connect the binding service component to the composite is called the wire. The service component connects the WebApp application using the wire to the Service Component Account, which is a BPEL component. The messages that are sent from the composite to the external world is called the reference.