[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] UML [See Unified Modeling Language (UML)] Unified Modeling Language (UML) abstract syntax and M2 layer and MOF as family of languages building languages within family future metamodel 2nd metamodel excerpt metamodel excerpt in MOF profiles 2nd representing marks versus MOF |