UML14 — What level of MOF 2.0 is the metamodel for UML 2.0?

UML 2.0 does not state which level of MOF (EMOF, CMOF, or
whatever else) provides its meta-meta-model. Therefore, there is
no formal statement defining which Class definition (Basic or
Constructs package level) and so forth is the basis for the
definitions in the UML 2.0 specification. UML tools implement
this class, so it's probably a good idea to know which one it's
supposed to be. (Proof, in case you're wondering: The names
EMOF and CMOF do not occur anywhere in the Superstructure
final adopted specification 03-08-02. The name MOF does, but
not in the context of which version of MOF defines the
UML metametamodel.)

If there is an ambiguity in which it is, the FTF needs to resolve
it. Once it's resolved ("The metamodel for UML 2.0 is CMOF"), it
should be stated clearly in the specification.

see above