| Meta-modeling |
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Meta-modeling is the construction of collection of "concepts" (things, terms, etc.) within a certain domain, and an attempt at describing the world around us for a particular purpose. Meta-model s are also referred to as “a precise definition of the constructs and rules needed for creating Semantic models” {Link without Title} . Beware. Meta-modeling has nothing to do with Metaprogramming . These are two completely different approaches. Spelling note The recommended standard orthograph is ''metamodeling'' but the alternative ''meta-modeling'' is also used from time to time. However the current trend seems now to write "metamodel" and mot "meta-model", "metamodeling" and not "meta-modeling". This is consistent with classical usage like Metaphysics , Metaprogramming , Metacognition , Metamathematics , Metalogic , Metalanguage , etc. Common purposes for meta-models are {Link without Title} :
Meta-models are most related to the term Ontology . “Metamodels, ontology and conceptual models are often used to describe and analyze the relations between concepts. A model is an abstraction of phenomena in the real world, and a metamodel is yet another abstraction highlighting properties of the model itself. Metamodeling is closely related to, and to some extent overlapping, ontology analysis and conceptual modeling” referring to [Gigch1991 . Ontology express something meaningful within a specified domain of interest by utilizing a grammar for using vocabulary. The grammar specifies what it means to be a well-formed statement, assertion, query, etc. (formal constraints) on how terms in the ontology’s controlled vocabulary can be used together. {Link without Title} Meta-modeling can be considered as an ''explicit'' description (constructs and rules) of how a domain-specific model is built. In particular, this comprises a formalized specification of the domain-specific notations. Typically, meta-models are – and always should – follow a strict rule set. “A valid metamodel is an ontology, but not all ontology are modeled ''explicitly'' as metamodels” [Metamodel-b . Zoos of meta-models. A library of similar meta-models has been called a '''Zoo''' of meta-models in paper . Several meta-model zoos may be found at: AtlanticZoo . Some are expressed in ECore . Others are written in MOF 1.4 - XMI 1.2. The metamodels expressed in UML - XMI 1.2 may be uploaded in Poseidon , a UML CASE tool. Types of Meta-models. For software engineering, several ''types'' of models (and their corresponding modeling activities) can be distinguished:
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