EFTA: a database retrieval algebra for feature-terms
Identifieur interne : 002E69 ( Main/Exploration ); précédent : 002E68; suivant : 002E70EFTA: a database retrieval algebra for feature-terms
Auteurs : Thomas Ludwig [Allemagne] ; Bernd Walter [Allemagne]Source :
- Data & Knowledge Engineering [ 0169-023X ] ; 1991.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Base de données.
English descriptors
- KwdEn :
Abstract
We define a data-model based on the notation of a feature-term. A Feature-Term Algebra (FTA) for database-retrieval of feature-terms is presented. FTA is comparable to other attempts to extend or modify Relational Algebra to cope with complex objects and set-valued attributes etc., but extends these proposals to an open-world-assumption for the processing of incomplete knowledge. Since we want to define the algebra as an intermediate language for the compilation of feature-logic database-queries, we augment it by a closure-operator to be able to compile recursive queries. Formal semantics of this Extended Feature-Term Algebra (EFTA) are given, its expressive power is investigated, and the algebra is discussed in the context of related work.
Url:
DOI: 10.1016/0169-023X(91)90019-T
Affiliations:
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A Feature-Term Algebra (FTA) for database-retrieval of feature-terms is presented. FTA is comparable to other attempts to extend or modify Relational Algebra to cope with complex objects and set-valued attributes etc., but extends these proposals to an open-world-assumption for the processing of incomplete knowledge. Since we want to define the algebra as an intermediate language for the compilation of feature-logic database-queries, we augment it by a closure-operator to be able to compile recursive queries. 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