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Peer reviewedVan Gyseghem, Nancy; De Caluwe, Rita – Journal of the American Society for Information Science, 1998
Discusses how imprecision and uncertainty are dealt with in the UFO (Uncertainty and Fuzziness in an Object-oriented) database model. Such information is expressed by means of possibility distributions, and modeled by means of the proposed concept of "role objects." The role objects model uncertain, tentative information about objects,…
Descriptors: Computer System Design, Database Design, Information Retrieval, Information Sources
Peer reviewedBosc, Patrick; Dubois, Didier; Prade, Henri – Journal of the American Society for Information Science, 1998
For about 10 years, several proposals to deal with ill-known information in database management systems have been made, and extensions of the relational data model have been proposed. An overview of functional dependencies is provided, and the connection between fuzzy functional dependencies and database design is discussed. (AEF)
Descriptors: Computer System Design, Database Design, Database Management Systems, Information Management
