The Oracle documentation for BPMN is available at http://oracle-bpel.blogspot.com/2009/09/oracle-bpel-informative-web-sites.html
Following are the important points worth remembering
- A BPM Process can be converted to BPEL process
 - BPM Process is a Composite Application
 - Different Types of Business process are
 - Synchronous
 - Asynchronous
 - Manual
 - To expose a process as a service, your process must begin with a message start event
 - The message start event enables you to specify input and output arguments to a process.
 - It supports Timer Start Event which can be scheduled to kickoff at a certain time
 - If you are invoking a process or service synchronously, use the service task.