UML14 — UML 1.0: Collaborations not well defined

Summary: Collaborations, especially Collaboration Digarams, are not defined very well,
given the following quotes:

The SG states on p. 86:
"A collaboration may be presented at two different levels: specification
level or instance level. A diagram presenting the collaboration at the
specification level will show classifier roles and association roles, while
a diagram at the instance level will present instances and links conforming
to the roles in the collaboration."

So, according to the SG, there are TWO kinds of collaboration diagrams: one
containing ClassifierRoles and one containing Instances.

Fixed in UML 1.3.