Ontop: Answering SPARQL Queries over Relational Databases

Date: February 12, 2016

Speaker: Guohui Xiao, Free University of Bozen-Bolzano, Italy

Abstract

Ontop is an open-source Ontology-Based Data Access (OBDA) system that allows for querying relational data sources through a conceptual representation of the domain of interest, provided in terms of an ontology, to which the data sources are mapped. Key features of Ontop are its solid theoretical foundations, a virtual approach to OBDA, which avoids materializing triples and is implemented through the query rewriting technique, extensive optimizations exploiting all elements of the OBDA architecture, its compliance to all relevant W3C recommendations (including SPARQL queries, R2RML mappings, and OWL 2 QL and RDFS ontologies), and its support for all major relational databases. To facilitate mapping editing and management, Ontop has implemented a plugin for Protégé, which provides a graphical interface for various key functionalities related to OBDA.

References

• Roman Kontchakov, Martin Rezk, Mariano Rodriguez-Muro, Guohui Xiao, and Michael Zakharyaschev. Answering SPARQL Queries over Databases under OWL 2 QL Entailment Regime. In: Proc. of International Semantic Web Conference (ISWC 2014). LNCS. Springer, 2014.
• Diego Calvanese, Benjamin Cogrel, Sarah Komla-Ebri, Roman Kontchakov, Davide Lanti, Martin Rezk, Mariano Rodriguez-Muro, and Guohui Xiao. Ontop: Answering SPARQL Queries over Relational Databases. In: Semantic Web Journal (2016) (to appear).
• Elena Botoeva, Diego Calvanese, Valerio Santarelli, Domenico F. Savo, Alessandro Solimando, and Guohui Xiao. Beyond OWL 2 QL in OBDA: Rewritings and Approximations. In: Proc. of AAAI. 2016 (to appear).