Practical Applications of Extended Deductive Databases in DATALOG*

  • A wide range of additional forward chaining applications could be realized with deductive databases, if their rule formalism, their immediate consequence operator, and their fixpoint iteration process would be more flexible. Deductive databases normally represent knowledge using stratified Datalog programs with default negation. But many practical applications of forward chaining require an extensible set of user–defined built–in predicates. Moreover, they often need function symbols for building complex data structures, and the stratified fixpoint iteration has to be extended by aggregation operations. We present an new language Datalog*, which extends Datalog by stratified meta–predicates (including default negation), function symbols, and user–defined built–in predicates, which are implemented and evaluated top–down in Prolog. All predicates are subject to the same backtracking mechanism. The bottom–up fixpoint iteration can aggregate the derived facts after each iteration based on user–defined Prolog predicates.

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Author:Dietmar Seipel
Document Type:Conference Proceeding
Year of Completion:2010
Publishing Institution:Universität Potsdam
Contributing Corporation:Gesellschaft für Logische Programmierung e.V.
Release Date:2010/03/04
Tag:Prolog; XM; bottom–up; built–in predicates; deductive databases; forward / backward chaining; function symbols; stratification; top– down
Source:Proceedings of the 23rd Workshop on (Constraint) Logic Programming 2009 / Geske, Ulrich; Wolf, Armin (Hrsg.). - Potsdam : Universitätsverlag, 2010. - S. 37 - 50
RVK - Regensburg Classification:ST 304
Organizational units:Extern / Extern
Dewey Decimal Classification:0 Informatik, Informationswissenschaft, allgemeine Werke / 00 Informatik, Wissen, Systeme / 004 Datenverarbeitung; Informatik
Collections:Universität Potsdam / Tagungsbände/Proceedings (nicht forlaufend) / Proceedings of the 23rd Workshop on (Constraint) Logic Programming 2009 / Databases
Licence (German):License LogoKeine Nutzungslizenz vergeben - es gilt das deutsche Urheberrecht