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- W2970294728 abstract "The ANSI/X3/SPARC study group on database management systems 2 as well as some independent researchers 17 , 10 have proposed a three-level coexistence architecture to database management systems. Under this approach (see Figure 1 ) a number of different users can be supported by means of different External Schemas, possibly with different data models and languages. It involves construction of a conceptual schema which completely represents the structure and semantics of a particular database. The underlying internal schema must provide a storage representation for the conceptual schema. Although the composition and scope of the conceptual schema is still a matter of controversy, 1 several data models, semantic models (e.g., References 7 , 8 , 9 , 13 , 16 , 20 , 21 ) etc. could be considered as candidates for defining conceptual schema. Given a particular model for the conceptual schema, a number of problems arise in its implementation into a three-level DBMS, particularly regarding the design of an internal schema specification language to specify the mapping of the model into storage." @default.
- W2970294728 created "2019-09-05" @default.
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- W2970294728 date "1979-06-01" @default.
- W2970294728 modified "2023-09-26" @default.
- W2970294728 title "On the implementation of a conceptual schema model within a three-level DBMS architecture*" @default.
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- W2970294728 doi "https://doi.org/10.1109/mark.1979.8817084" @default.
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