I thought that the
class would be a convenient place to put some hooks for injection of
CDO-specific bahviour. However, I notice that some Papyrus diagrams
don't extend this class. Most do, but the SysML diagrams and a couple
of UML diagrams do not.
What is the purpose of this class? It currently defines no behaviour
of its own. Should all Papyrus diagams use it? It would be good for
me if they did ...