@inproceedings{bisc-etal-2015DL,
	title = {Schema-Agnostic Query Rewriting for {OWL} {QL}},
booktitle = {28th International Workshop on Description Logics (DL2015)},
        abstract = {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.},
        author = {Stefan Bischof and Markus Kr{\"o}tzsch and Axel Polleres and Sebastian Rudolph},
year = 2015,
month = jun,
day = {7--10},
url       = {http://www.polleres.net/publications/bisc-etal-2015DL.pdf},
address = {Athens, Greece},
note = {Extended Abstract (full paper at ISWC2014).}
}

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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. 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OWL QL is a popular member\nof the DL-Lite family that is part of the W3C OWL 2 standard. Typical\nimplementations use the OWL QL TBox to rewrite a conjunctive query\ninto an equivalent set of queries, to be answered against the ABox of\nthe ontology. With the adoption of the recent SPARQL 1.1 standard,\nhowever, RDF databases are capable of answering much more expressive\nqueries directly, and we ask how this can be exploited in query\nrewriting. We find that SPARQL 1.1 is powerful enough to ``implement'' a\nfull-fledged OWL QL reasoner in a single query. Using additional\nSPARQL 1.1 features, we develop a new method of schema-agnostic query\nrewriting, where arbitrary conjunctive queries over OWL QL are\nrewritten into equivalent SPARQL 1.1 queries in a way that is fully\nindependent of the actual schema. 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