A system for computing constrained default logic extensions

G. Antoniou, A. P. Courtney, J. Ernsttand, M. A. Williams

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Citations (Scopus)


The aim of this paper is to describe the algorithmic foundations of the part of the program Exten responsible for the computation of extensions in Constrained Default Logic. Exten is a system that computes extensions for various default logics. The efficiency of the system is increased by pruning techniques for the search tree. We motivate and present these techniques, and demonstrate that they can cut down the size of the search tree significantly. Quite importantly, they complement well the recently developed stratification method. This technique has to be modified to work properly with Constrained Default Logic, and we show how this can be done. Exten supports experimentation with default logic, allowing the user to set various parameters. Also it has been designed to be open to future enhancements, which are supported by its object-oriented design. Exten is part of our long-term effort to develop an integrated toolkit for intelligent information management based on nonmonotonic reasoning and befief revision methods.

Original languageEnglish
Title of host publicationLogics in Artificial Intelligence - European Workshop, JELIA 1996, Proceedings
EditorsJose Julio Alferes, Luis Moniz Pereira, Ewa Orlowska
PublisherSpringer Verlag
Number of pages14
ISBN (Print)9783540616306
Publication statusPublished - Oct 1996
Externally publishedYes
Event6th European Workshop on Logics in Artificial Intelligence - Evora, Portugal
Duration: 30 Sep 19963 Oct 1996
Conference number: 6

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference6th European Workshop on Logics in Artificial Intelligence
Abbreviated titleJELIA 1996
Internet address


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