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Justifications for logic programs under answer set semantics

Published online by Cambridge University Press:  01 January 2009

ENRICO PONTELLI ,
TRAN CAO SON  and
OMAR ELKHATIB
ENRICO PONTELLI
Affiliation:
Department of Computer Science, New Mexico State University, Las Cruces, NM, USA (e-mail: epontell@cs.nmsu.edu, tson@cs.nmsu.edu, okhatib@cs.nmsu.edu)
TRAN CAO SON
Affiliation:
Department of Computer Science, New Mexico State University, Las Cruces, NM, USA (e-mail: epontell@cs.nmsu.edu, tson@cs.nmsu.edu, okhatib@cs.nmsu.edu)
OMAR ELKHATIB
Affiliation:
Department of Computer Science, New Mexico State University, Las Cruces, NM, USA (e-mail: epontell@cs.nmsu.edu, tson@cs.nmsu.edu, okhatib@cs.nmsu.edu)
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Abstract

The paper introduces the notion of offline justification for answer set programming (ASP). Justifications provide a graph-based explanation of the truth value of an atom with respect to a given answer set. The paper extends also this notion to provide justification of atoms during the computation of an answer set (on-line justification) and presents an integration of online justifications within the computation model of Smodels. Offline and online justifications provide useful tools to enhance understanding of ASP, and they offer a basic data structure to support methodologies and tools for debugging answer set programs. A preliminary implementation has been developed in – .

Keywords

answer set programmingjustificationoffline justificationonline justification
Type
Regular Papers
Information
Theory and Practice of Logic Programming , Volume 9 , Issue 1 , January 2009 , pp. 1 - 56
Copyright
Copyright © Cambridge University Press 2009

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