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Answering SPARQL Queries over Databases under OWL 2 QL Entailment Regime
| Citations: | 16 - 6 self |
BibTeX
@MISC{Kontchakov_answeringsparql,
author = {Roman Kontchakov and Martin Rezk and Mariano Rodríguez-muro and Guohui Xiao and Michael Zakharyaschev},
title = {Answering SPARQL Queries over Databases under OWL 2 QL Entailment Regime},
year = {}
}
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Abstract
Abstract. 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 technologies—the tree-witness query rewriting, T-mappings compiling R2RML mappings with ontology hierarchies, and T-mapping optimisations using SQL expressivity and database integrity constraints—the system produces scalable SQL queries. 1
Keyphrases
sparql query ql entailment regime r2rml mapping practical side database integrity scalable sql query ql ontology initial experimental result theoretical side ontology-based data access platform ontop t-mapping optimisation ql direct semantics entailment regime sql expressivity equivalent sql query ontology hierarchy relational database tree-witness query rewriting data instance input sparql query
