Page "Meta-Object Facility" Paragraph 4

MOF is a closed metamodeling architecture ; it defines an M3-model, which conforms to itself.

MOF allows a strict meta-modeling architecture ; every model element on every layer is strictly in correspondence with a model element of the layer above.

MOF only provides a means to define the structure, or abstract syntax of a language or of data.

For defining metamodels, MOF plays exactly the role that EBNF plays for defining programming language grammars.

MOF is a Domain Specific Language ( DSL ) used to define metamodels, just as EBNF is a DSL for defining grammars.

Similarly to EBNF, MOF could be defined in MOF.