Abstract
We present Ontop, 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.
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