Beyond OWL 2 QL in OBDA: Rewritings and Approximations (Extended Version)

no code implementations • 26 Nov 2015 • Elena Botoeva, Diego Calvanese, Valerio Santarelli, Domenico Fabio Savo, Alessandro Solimando, Guohui Xiao

Ontology-based data access (OBDA) is a novel paradigm facilitating access to relational data, realized by linking data sources to an ontology by means of declarative mappings.

CQE in Description Logics Through Instance Indistinguishability (extended version)

no code implementations • 24 Apr 2020 • Gianluca Cima, Domenico Lembo, Riccardo Rosati, Domenico Fabio Savo

Finally, we identify a semantically well-founded notion of approximated query answering for CQE, and prove that, for DL-Lite$_{\mathcal{R}}$ ontologies, this form of CQE is tractable with respect to data complexity and is first-order rewritable, i. e., it is always reducible to the evaluation of a first-order query over the data instance.

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CQE in OWL 2 QL: A "Longest Honeymoon" Approach (extended version)

no code implementations • 22 Jul 2022 • Piero Bonatti, Gianluca Cima, Domenico Lembo, Lorenzo Marconi, Riccardo Rosati, Luigi Sauro, Domenico Fabio Savo

Controlled Query Evaluation (CQE) has been recently studied in the context of Semantic Web ontologies.