SPARQL-DL: SPARQL Query for OWL-DL
There are many Query Languages (QLs) that can be used to query RDF (Resource Description Framework) and OWL (Ontology Web Language) ontologies but neither type is satisfactory for querying OWL-DL ontologies. RDF-based QLs (RDQL, SeRQL, SPARQL) are harder to give a semantics w.r.t. OWL-DL and are more powerful than what OWL-DL reasoners can provide. DL-based QLs (DIG ask queries, nRQL) have clear semantics but are not powerful enough in the general case. In this paper, the authors describe SPARQL-DL, a substantial subset of SPARQL for which they provide a clear OWL-DL based semantics.