Answering SPARQL Queries over Databases under OWL 2 QL Entailment Regime
Semantic Web Conference(2014)
摘要
We present an extension of the ontology-based data access platform Ontop that supports answering SPARQL queries under the OWL 2 QL direct semantics entailment regime for data instances stored in relational databases. On the theoretical side, we show how any input SPARQL query, OWL 2 QL ontology and R2RML mappings can be rewritten to an equivalent SQL query solely over the data. On the practical side, we present initial experimental results demonstrating that by applying the Ontop technologiesthe tree-witness query rewriting, -mappings compiling R2RML mappings with ontology hierarchies, and -mapping optimisations using SQL expressivity and database integrity constraintsthe system produces scalable SQL queries.
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