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cs.DB2020
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,…
cs.DB2020
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…