Istituto di Scienza e Tecnologie dell'Informazione     
Straccia U. SoftFacts: a top-k retrieval engine for a tractable description logic accessing relational databases. Technical report, 2009.
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 tractable DLR-Lite like description logic) the relevant abstract concepts and relations of the application domain, while facts are stored into a relational database. The results of a query may be ranked according to some scoring function. We will illustrate its logical model, its architecture, its representation and query language, the reasoning algorithms and the experiments we conducted.
Subject Description Logics
Fuzzy Logic
Top-k retrieval
I.2.4 Knowledge Representation Formalisms and Methods

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