What is the Unified Modeling Language metamodel?
A metamodel is a model of a model. Think of it this way: Developers create things like class diagrams and object diagrams to model a system under development; this resulting model describes a system. A metamodel is a model of that model. Metamodels are important, because they can provide a single, common, and unambiguous statement of the syntax and semantics of a model. We began our work on the Unified Modeling Language by starting with a metamodel, because it let us come to rapid agreement about the meaning of things (and the very things themselves) that were to constitute our unification. Thus, our metamodel includes some obvious things like classes and objects (which are isomorphic to the elements of the modeling language) and some nonobvious things like uninterpreted and nonclass decls (which are artifacts of the metamodel). For most users, the metamodel is invisible (as it should be). It’s valuable to us, because it lets us communicate our intended semantics to each other and to t
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