Please use this identifier to cite or link to this item: doi:10.22028/D291-25235
Title: Integrating bottom-up and top-down reasoning in COLAB
Author(s): Harm, Martin
Hinkelmann, Knut
Labisch, Thomas
Language: English
Year of Publication: 1992
OPUS Source: Kaiserslautern ; Saarbrücken : DFKI, 1992
SWD key words: Künstliche Intelligenz
Free key words: Artificial Intelligence
DDC notations: 004 Computer science, internet
Publikation type: Report
Abstract: The knowledge compilation laboratory COLAB integrates declarative knowledge representation formalisms, providing source-to-source and source-to-code compilers of various knowledge types. Its architecture separates taxonomical and assertional knowledge. The assertional component consists of a constraint system and a rule system, which supports bottom-up and top-down reasoning of Horn clauses. Two approaches for forward reasoning have been implemented. The first set-oriented approach uses a fixpoint computation. It allows top-down verification of selected premises. Goal-directed bottom-up reasoning is achieved by a magic-set transformation of the rules with respect to a goal. The second tuple-oriented approach reasons forward to derive the consequences of an explicitly given set of facts. This is achieved by a transformation of the rules to top-down executable Horn clauses. The paper gives an overview of the various forward reasoning approaches, their compilation into an abstract machine and their integration into the COLAB shell.
Link to this record: urn:nbn:de:bsz:291-scidok-50645
Series name: Document / Deutsches Forschungszentrum für Künstliche Intelligenz : D [ISSN 0946-0098]
Series volume: 92-27
Date of registration: 7-Mar-2013
Faculty: SE - Sonstige Einrichtungen
Department: SE - DFKI Deutsches Forschungszentrum für Künstliche Intelligenz
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

Files for this record:
File Description SizeFormat 
D_92_27.pdf18,5 MBAdobe PDFView/Open

Items in SciDok are protected by copyright, with all rights reserved, unless otherwise indicated.