VDML12 — In 7.2.1.1.3, under the SuperClass heading both PortContainer and Participant should be listed

A Collaboration is both Participant and PortContainer.
Not only Figure 7.6 tells that, but also the following text:
• In 7.2.1.1.3: "Collection of Participants joined together for a shared purpose or interest."
• In 7.2.1.1.4: "Participants can be Actors (human or automatons) or Collaborations or Roles of Actors or Collaborations."
• Probably on more places (I expect so).
However, in 7.2.1.1.3, under the SuperClass heading, only PortContainer is listed, and Participant has been overlooked.
This is an omission and should be fixed.