Geodesic
Representing and Querying Multiple Ontologies with Contextual Logic Programming
Computer Science and Information Systems, Tome 5 (2008) no. 2.

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The system presented in this paper uses Contextual Logic Programming as a computational hub for representing and reasoning over knowledge modeled by web ontologies, integrating the approach with similar mechanisms which we already developed. As a result of its Logic Programming heritage, the system may also recursively interrogate other ontologies or data repositories, providing a semantic integration of multiple sources. The components required to behave as a SPARQL query engine are explained and examples of integration of difierent sources are shown – in particular, the case of multiple OWL ontologies is discussed.
Keywords: Ontologies (OWL), Logic Programming, SPARQL 
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     author = {Nuno Lopes and Cl\'audio Fernandes and Salvador Abreu},
     title = {Representing and {Querying} {Multiple} {Ontologies} with {Contextual} {Logic} {Programming}},
     journal = {Computer Science and Information Systems},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {2008},
     url = {http://geodesic.mathdoc.fr/item/CSIS_2008_5_2_a4/}
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Nuno Lopes; Cláudio Fernandes; Salvador Abreu. Representing and Querying Multiple Ontologies with Contextual Logic Programming. Computer Science and Information Systems, Tome 5 (2008) no. 2. http://geodesic.mathdoc.fr/item/CSIS_2008_5_2_a4/