On Querying Ontologies with Contextual Logic Programming.
Cláudio Fernandes, Nuno Lopes, Salvador Abreu · OWL: Experiences and Directions · 2007
We describe a system in which Contextual Logic Programming is used as a mediator for knowledge modeled by ontologies. Our system provides the components required to behave as a SPARQL query engine and, as a result of its Logic Programming heritage, it may also recursively interrogate other ontologies or data repositories, providing a semantic integration of multiple sources.