Sorry, maybe not the absolute right place, but could not find anything for leading the question directly to the BPMN Spec guys.
In the BPMN Spec 2.0 (found on http://www.bpmn.org/) I could not find any description for sub-processes being able to use a reference to an already created BPMN-process. It looks like each time you have a sub-process you need to define it there.
The reuse of already created processes as a sub-process within another process seems not possible to me. I hope I am wrong, otherwise the re-useability is pretty poor in BPMN and you would have to define many times the same thing. If I am wrong, could anybody tell me how a reference to a process as a sub-process will be defined within the BPMN 2.0 notation.
I think you looked at embedded sub processes, which are not reusable. Reusable sub processes are created just like a normal process and invoked from a main process with a call activity.
The call activity, is it an Activiti specific matter or a BPMN Spec matter ? I looked up in the BPMN 2.0 Spec for something like this, but could not find anything.
10.2 Activities An Activity is work that is performed within a Business Process. An Activity can be atomic or non-atomic (compound). The types of Activities that are a part of a Process are: Task, Sub-Process, and Call Activity, which allows the inclusion of re-usable Tasks and Processes in the diagram. However, a Process is not a specific graphical object. Instead, it is a set of graphical objects. The following sections will focus on the graphical objects Sub-Process and Task.
Read the Spec pretty much (about 500 pages 😉 but I guess I did not quiet understand the Call Activity. If this is the right mean for what I was asking for - great. I go and study it in more detail.
