Jan Uhlir [https://community.jboss.org/people/espinosa_cz] created the 
discussion

"Re: Did JBPM 5+ drop jPDL support? Only BPMN?"

To view the discussion, visit: https://community.jboss.org/message/649734#649734

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Well, this explanation on StackOverflow is even more explaininig:
 
http://stackoverflow.com/questions/3545219/what-are-the-differences-between-jbpm-and-activiti-bpmn
 
http://stackoverflow.com/questions/3545219/what-are-the-differences-between-jbpm-and-activiti-bpmn
Citation from  http://stackoverflow.com/users/252155/amir-moghimi Amir Moghimi 
remark:
> ...
> jBPM is quite a famous name in the Java workflow engine domain and you may be 
> surprised to hear that  http://www.jboss.org/jbpm jBPM 5 is NOT the 5th 
> version of that infamous old jBPM engine! In fact, it is a re-branding of 
> another workflow engine developed by JBoss which was previously called  
> http://www.jboss.org/drools/drools-flow Drools Flow; and as the name 
> suggests, it was part of the Drools Rules Engine project, used as an 
> integrated workflow engine inside Drools. 
> 
> Actually, as far as I know, what has happened is that  
> http://www.blogger.com/profile/03067067751334471585 Tom Baeyens, who was the 
> founder of jBPM, and  http://www.jorambarrez.be/blog/ Joram Barrez, who was a 
> jBPM core developer, have left JBoss/Red Hat (and hence, jBPM 4) and joined 
> Alfresco to start a new workflow engine:  http://www.activiti.org/ Activiti. 
> So, JBoss has decided to stop further developing and maintaining jBPM 4 
> code-base and started investing its resources on jBPM's in-house competitor, 
> Drools Flow. But they have re-branded it as jBPM 5 to use the existing 
> reputation and fame that jBPM has built up. Therefore, when we are talking 
> about jBPM 5, we are in fact talking about Drools Flow.
> ....
This actually explains it all.
As I evaluting jBPM5 more and more, I have only to agree.

There are more disturbing news:
> Citing again from  http://stackoverflow.com/users/252155/amir-moghimi Amir 
> Moghimi):
> 
> Considering this little history, it's no surprise to see that jBPM 5 is a 
> completely different workflow engine compared to jBPM 4 with a totally 
> different API and documentation, lacking almost all the maturity and 
> community support existing on jBPM 4
> 
> 
Cheers
Espinosa
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