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"%3ADescription%2FOntop-20is-20a-20platform-20to-20query-20databases-20as-20Virtual-20RDF-20Graphs-20using-20SPARQL.-20It%27s-20extremely-20fast-20and-20is-20packed-20with-20features.-20Ontop-20is-20an-20open-2Dsource-20Ontology-20Based-20Data-20Access-20%28OBDA%29-20system-20that-20allows-20for-20querying-20relational-20data-20sources-20through-20a-20conceptual-20representation-20of-20the-20domain-20of-20interest%2C-20provided-20in-20terms-20of-20an-20ontology%2C-20to-20which-20the-20data-20sources-20are-20mapped.-20Key-20features-20of-20Ontop-20are-20its-20solid-20theoretical-20foundations%2C-20a-20virtual-20approach-20to-20OBDA-20that-20avoids-20materializing-20triples-20and-20that-20is-20implemented-20through-20query-20rewriting-20techniques%2C-20extensive-20optimizations-20exploiting-20all-20elements-20of-20the-20OBDA-20architecture%2C-20its-20compliance-20to-20all-20relevant-20W3C-20recommendations-20%28including-20SPARQL-20queries%2C-20R2RML-20mappings%2C-20and-20OWL-202-20QL-20and-20RDFS-20ontologies%29%2C-20and-20its-20support-20for-20all-20major-20relational-20databases." contains the "%" character as part of a property label and has been classified as invalid.

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