177 citations · 621 across the 42 of their papers we have counts for
4 papers · 2 filters
First-Order Rewritability of Frontier-Guarded Ontology-Mediated Queries
Pablo Barcelo, Gerald Berger, Carsten Lutz +1
We focus on ontology-mediated queries (OMQs) based on (frontier-)guarded existential rules and (unions of) conjunctive queries, and we investigate the problem of FO-rewritability,…
Query Expressibility and Verification in Ontology-Based Data Access
Carsten Lutz, Johannes Marti, Leif Sabellek
In ontology-based data access, multiple data sources are integrated using an ontology and mappings. In practice, this is often achieved by a bootstrapping process, that is, the ont…
Holding a Conference Online and Live due to COVID-19
Angela Bonifati, Giovanna Guerrini, Carsten Lutz +6
The joint EDBT/ICDT conference (International Conference on Extending Database Technology/International Conference on Database Theory) is a well established conference series on da…
When is Ontology-Mediated Querying Efficient?
Pablo Barcelo, Cristina Feier, Carsten Lutz +1
In ontology-mediated querying, description logic (DL) ontologies are used to enrich incomplete data with domain knowledge which results in more complete answers to queries. However…