BPMN21 — definitionalCollaborationRef should be 0..*

Table 10.1, definitionalCollaborationRef includes the phrase “For Processes that interact with other Participants,” which implies that Processes are Participants. In fact they are distinct elements in the metamodel.

More significantly it states “The definitional Collaboration specifies the Participants the Process interacts with, and more specifically, which individual service, Send or Receive Task, or Message Event, is connected to which Participant through Message Flow.” However a Process could be linked to Participants in many Collaborations and so the multiplicity of [0..1] seems over-limiting.