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DOI: 10.4230/OASIcs.SLATE.2012.25
URN: urn:nbn:de:0030-drops-35123
URL: http://drops.dagstuhl.de/opus/volltexte/2012/3512/

Santos, Joćo ; Rocha, Ricardo

Mode-Directed Tabling and Applications in the YapTab System

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Abstract

Tabling is an implementation technique that solves some limitations of Prolog's operational semantics in dealing with recursion and redundant sub-computations. Tabling works by memorizing generated answers and then by reusing them on similar calls that appear during the resolution process. In a traditional tabling system, all the arguments of a tabled subgoal call are considered when storing answers into the table space. Traditional tabling systems are thus very good for problems that require finding all answers. Mode-directed tabling is an extension to the tabling technique that supports the definition of selective criteria for specifying how answers are inserted into the table space. Implementations of mode-directed tabling are already available in systems like ALS-Prolog, B-Prolog and XSB. In this paper, we propose a more general approach to the declaration and use of mode-directed tabling, implemented on top of the YapTab tabling system, and we show applications of our approach to problems involving Justification, Preferences and Answer Subsumption.

BibTeX - Entry

@InProceedings{santos_et_al:OASIcs:2012:3512,
  author =	{Jo{\~a}o Santos and Ricardo Rocha},
  title =	{{Mode-Directed Tabling and Applications in the YapTab System}},
  booktitle =	{1st Symposium on Languages, Applications and Technologies},
  pages =	{25--40},
  series =	{OpenAccess Series in Informatics (OASIcs)},
  ISBN =	{978-3-939897-40-8},
  ISSN =	{2190-6807},
  year =	{2012},
  volume =	{21},
  editor =	{Alberto Sim{\~o}es and Ricardo Queir{\'o}s and Daniela da Cruz},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{http://drops.dagstuhl.de/opus/volltexte/2012/3512},
  URN =		{urn:nbn:de:0030-drops-35123},
  doi =		{http://dx.doi.org/10.4230/OASIcs.SLATE.2012.25},
  annote =	{Keywords: Tabling, Mode Operators, Applications}
}

Keywords: Tabling, Mode Operators, Applications
Seminar: 1st Symposium on Languages, Applications and Technologies
Issue date: 2012
Date of publication: 21.06.2012


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