Datalog LITE: a deductive query language with linear time model checking

  • Authors:
  • Georg Gottlob;Erich Grädel;Helmut Veith

  • Affiliations:
  • Vienna University of Technology, Wien, Austria;RWTH Aachen, Aachen, Germany;Vienna University of Technology, Wien, Austria

  • Venue:
  • ACM Transactions on Computational Logic (TOCL)
  • Year:
  • 2002

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Abstract

We present Datalog LITE, a new deductive query language with a linear-time model-checking algorithm, that is, linear time data complexity and program complexity. Datalog LITE is a variant of Datalog that uses stratified negation, restricted variable occurrences and a limited form of universal quantification in rule bodies.Despite linear-time evaluation, Datalog LITE is highly expressive: It encompasses popular modal and temporal logics such as CTL or the alternation-free μ-calculus. In fact, these formalisms have natural presentations as fragments of Datalog LITE. Further, Datalog LITE is equivalent to the alternation-free portion of guarded fixed-point logic. Consequently, linear-time model checking algorithms for all mentioned logics are obtained in a unified way.The results are complemented by inexpressibility proofs to the effect that linear-time fragments of stratified Datalog have too limited expressive power.