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Directional Type Checking for Logic Programs: Beyond Discriminative Types

  • Witold Charatonik
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1782)

Abstract

Directional types form a type system for logic programs which is based on the view of a predicate as a directional procedure which, when applied to a tuple of input terms, generates a tuple of output terms. It is known that directional-type checking wrt. arbitrary types is undecidable; several authors proved decidability of the problem wrt. discriminative regular types. In this paper, using techniques based on tree automata, we show that directional-type checking for logic programs wrt. general regular types is Dexptime-complete and fixed-parameter linear. The latter result shows that despite the exponential lower bound, the type system might be usable in practice.

Keywords

types in logic programming directional types regular types tree automata 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Witold Charatonik
    • 1
    • 2
  1. 1.Max-Planck-Institut für InformatikSaarbrückenGermany
  2. 2.University of WrocławPoland

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