The 'events' in SOA/BPM 11g suite are represented as 'signals' in a BPMN process.
Here is a tutorial documenting the interaction between BPMN process and events.
http://niallcblogs.blogspot.com/2010/11/bpm-signal-events-and-oracle-edn.html
http://niallcblogs.blogspot.com/2010/11/bpm-signal-events-and-edn-part-2.html
