swMATH ID: 22931
Software Authors: Roman Kontchakov; Martin Rezk; Mariano Rodríguez-Muro; Guohui Xiao; Michael Zakharyaschev
Description: Answering SPARQL Queries over Databases under OWL 2 QL Entailment Regime. 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, -mappings compiling R2RML mappings with ontology hierarchies, and -mapping optimisations using SQL expressivity and database integrity constraints—the system produces scalable SQL queries.
Homepage: https://link.springer.com/chapter/10.1007%2F978-3-319-11964-9_35
Related Software: MASTRO; SPARQL; LUBM; DBpedia; Datalog; Graal; RDFox; ContentCVS; E Theorem Prover; IQ-Meter; Volcano; iBench; DLV; Vadalog; MiniCon; DLV2; Polyanna; CEX; PAGOdA; PrivateLR
Referenced in: 13 Publications

Standard Articles

1 Publication describing the Software Year
Answering SPARQL queries over databases under OWL 2 QL entailment regime
Kontchakov, Roman; Rezk, Martin; Rodríguez-Muro, Mariano; Xiao, Guohui; Zakharyaschev, Michael

Referencing Publications by Year