Istituto di Scienza e Tecnologie dell'Informazione     
Straccia U. SoftFacts: a top-k retrieval engine for ontology mediated access to relational databases. In: SMC 2010 - IEEE International Conference on Systems, Man and Cybernetics (Istanbul, Turkey, 10-12 October 2010). Proceedings, pp. 4115 - 4122. IEEE, 2010.
We outline SoftFacts, an ontology mediated top-k information retrieval system over relational databases. An ontology layer is used to define (in terms of a OWL-QL like Semantic Web language) the relevant abstract concepts and relations of the application domain, while graded facts are stored into a relational database. Queries are conjunctive queries with ranking aggregates and scoring functions and the results of a query may be ranked according to user defined scoring functions. We will illustrate SoftFacts' architecture, the representation and the query language, sketch the reasoning algorithms of the SoftFacts~system and its Protege plug-in.
Subject Description Logics
F.4 Mathematical Logic and Formal Languages

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