Two-layer BPM enables you to model business processes using a layered approach. In that model, a first level is a very abstract specification of the business process. Activities of a first-level process delegate the work to processes or services in a second level. Figure 55-1 illustrates this behavior.

In Figure 55-1, the phase I activity of the business process can delegate its work to one of the corresponding layer II processes: Task 1.1, Task 1.2, or Task 1.3.

The two-layer BPM functionality enables you to create the key element (namely, the phase activity) declaratively.

By using the design time and runtime functionality of Oracle Business Rules, you can add more channels dynamically without having to redeploy the business process. Design time at runtime enables you to add rules (columns) to the dynamic routing decision table at runtime. Then, during runtime, business process instances consider those new rules and eventually route the requests to a different channel.

The design time at runtime functionality of Oracle Business Rules also enables you to modify the endpoint reference of a service that is invoked from a phase activity, pointing that reference to a different service.