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Lecture Notes in Computer Science
In the setting of ontology-mediated query answering, a query is evaluated over a knowledge base consisting of a database instance and an ontology. While most work in the area focuses on conjunctive queries, navigational queries are gaining increasing attention. In this paper, we investigate the complexity of evaluating the standard form of navigational queries, namely two-way regular path queries, over knowledge bases whose ontology is expressed by means of linear existential rules. Moredoi:10.1007/978-3-319-45276-0_1 fatcat:y6z76z5kxrd7tdnzdv5bsurj2e