You wire (connect) services, service components, and references. For this example, you wire the web service and service component. Note the following:

• Since a web service is an inbound service, a reference handle displays on the right side. Web services that are outbound references do not have a reference handle on the right side.

• You can drag a defined interface to an undefined interface in either direction (reference to service or service to reference). The undefined interface then inherits the defined interface. There are several exceptions to this rule:

  • A component has the right to reject a new interface. For example, an Oracle Mediator can only have one inbound service. Therefore, it rejects attempts to create a second service.

  • You cannot drag an outbound service (external reference) to a business rule, because business rules do not support references. When dragging a wire, the user interface highlights the interfaces that are valid targets.

• The port type and the namespace are used to uniquely identify an interface.

• You cannot wire services and composites that have different interfaces. For example, you cannot connect a web service configured with a synchronous WSDL file to an asynchronous BPEL process. Figure 2-17 provides details.

  Figure 2-17 Limitations on Wiring Services and Composites with Different Interfaces

  
  Description of "Figure 2-17 Limitations on Wiring Services and Composites with Different Interfaces"

  The service and reference must match, meaning the interface and the callback must be the same. If you have two services that have different interfaces, you can place an Oracle Mediator between the two services and perform a transformation between the interfaces.