Schema-Agnostic Query Rewriting for OWL QL. Bischof, S., Krötzsch, M., Polleres, A., & Rudolph, S. In 28th International Workshop on Description Logics (DL2015), Athens, Greece, June, 2015. Extended Abstract (full paper at ISWC2014).
Schema-Agnostic Query Rewriting for OWL QL [pdf]Paper  abstract   bibtex   
In this extended abstract, we review our recent research on ontology-based query answering in OWL QL, first published at the International Semantic Web Conference 2014. OWL QL is a popular member of the DL-Lite family that is part of the W3C OWL 2 standard. Typical implementations use the OWL QL TBox to rewrite a conjunctive query into an equivalent set of queries, to be answered against the ABox of the ontology. With the adoption of the recent SPARQL 1.1 standard, however, RDF databases are capable of answering much more expressive queries directly, and we ask how this can be exploited in query rewriting. We find that SPARQL 1.1 is powerful enough to ``implement'' a full-fledged OWL QL reasoner in a single query. Using additional SPARQL 1.1 features, we develop a new method of schema-agnostic query rewriting, where arbitrary conjunctive queries over OWL QL are rewritten into equivalent SPARQL 1.1 queries in a way that is fully independent of the actual schema. This allows us to query RDF data under OWL QL entailment without extracting or preprocessing OWL.

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