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Summary: Extended Faceted Ontologies
Yannis Tzitzikas1 2, Nicolas Spyratos3, Panos Constantopoulos1 2, and
Anastasia Analyti2
1
Department of Computer Science, University of Crete, Greece
2
Institute of Computer Science, ICS-FORTH
ftzitzik, panos, analytig@csi.forth.gr
3
Laboratoire de Recherche en Informatique, Universite de Paris-Sud, France
spyratos@lri.fr
Abstract. A faceted ontology consists of a set of facets, where each facet
consists of a prede nedset of terms structuredby a subsumptionrelation.
We propose two extensions of faceted ontologies, which allow inferring
conjunctions of terms that are valid in the underlying domain. We give a
model-theoretic interpretation to these extended faceted ontologies and
we provide mechanisms for inferring the valid conjunctions of terms.
This inference service can be exploited for preventing errors during the
indexing process and for deriving navigation trees that are suitable for
browsing. The proposed scheme has several advantages by comparison to
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