The process definition of jBPM does not comply with the process definition of the wfMC. The separation of responsibilities however is fairly similar, see http://www.jboss.org/products/jbpm/stateofworkflow
AFAIK is not WfMC comliant, I read something about in previous posts at
http://sourceforge.net/forum/?group_id=70542
or at
http://www.theserverside.com/news/thread.tss?thread_id=29521#143152
Cheers,
Igor.