Heiko, I don't agree with this. I believe that your arguments are correct, but in the scope of the PVM: in the PVM there shouldn't be any custom things, only activities without further notice. But JPDL is a language built upon this PVM. The point of the PVM is to *allow* customizations like the JPDL DSL. JPDL tries to be an all-around business process language. Mailing is something that is needed in many BPM use cases, so I believe it's only natural to take in account the mailing activity. I do agree that JPDL custom nodes must have boundaries, but mailing & sending a message to an ESB are such common BPM concepts, that they should be implemented in the language and not for every BPM project again and again. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4161428#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...