A constraint-based language for querying taxonomic systems

  • Margarida Mamede
  • Luís Monteiro
Constraints
Part of the Lecture Notes in Computer Science book series (LNCS, volume 541)

Abstract

This paper presents a language for querying taxonomic systems which is essentially a variant of first-order logic with terms denoting types instead of individuals. A query expressed in the language is either a declarative or an interrogative sentence. Declarative sentences correspond to the usual first-order formulae and require a “yes” or “no” answer. Interrogative sentences are basically declarative sentences with some variables stipulated as “query” variables, for which the required answers are type assignments to the query variables making the sentences true. From the semantic point of view, queries will be interpreted as type constraints on the query variables, and answers as constraints in a specified normal form called “solved” form. To that effect, the paper proposes a general scheme for constraint programming based on the notions of constraint satisfaction and constraint reduction, and shows how the query language can be viewed as an instance of the scheme. This constraint system is the basis of a constraint logic programming system dealing with type information as described by taxonomies.

Keywords

Logic Program Query Language Constraint Programming Atomic Type Reduction System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • Margarida Mamede
    • 1
  • Luís Monteiro
    • 1
  1. 1.Departamento de InformáticaUniversidade Nova de LisboaMonte da CaparicaPortugal

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