Revision programming, database updates and integrity constraints

  • V. Wiktor Marek
  • Mirosław Truszczyński
Contributed Papers Nonmonotonic Semantics II
Part of the Lecture Notes in Computer Science book series (LNCS, volume 893)

Abstract

We investigate revision programming, a logic-based mechanism for describing changes in databases and enforcing certain type of integrity constraints. We show that revisions justified by an initial database and a revision program can be computed by a sequential execution of the rules of the program (with subsequent check of the applicability of the rules). In general, a program may determine none, exactly one or many justified revisions of a given initial database. We exhibit two classes of programs, safe and stratified, with the property that for every initial database a unique justified revision exists. We study the complexity of basic problems associated with justified revisions. Although the existence problems are NP-complete, for safe and stratified programs justified revisions can be computed in polynomial time.

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Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • V. Wiktor Marek
    • 1
  • Mirosław Truszczyński
    • 1
  1. 1.Department of Computer ScienceUniversity of KentuckyLexington

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