Lorenzo Lepore

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Ontology-based data access (OBDA) is a novel paradigm for ac-cessing large data repositories through an ontology, that is a formal description of a domain of interest. Supporting the management of OBDA applications poses new challenges, as it requires to provide effective tools for (i) allowing both expert and non-expert users to analyze the OBDA(More)
The language Hi(DL-LiteR) is obtained from DL-LiteR by adding meta-modeling features, and is equipped with a query language that is able to express higher-order queries. We investigate the problem of answering a particular class of such queries, called instance higher-order queries posed over Hi(DL-LiteR) knowledge bases (KBs). The only existing algorithm(More)
Hi(OWL 2 QL) is a new ontology language with the OWL 2 QL syntax and a specific semantics designed to support metamodeling and metaquery-ing. In this paper we investigate the problem of answering metaqueries in Hi(OWL 2 QL), which are unions of conjunctive queries with both ABox and TBox atoms. We first focus on a specific class of ontologies, called(More)
Recent OBDA projects have pointed out that one of the drawbacks of OWL 2 is the lack of metamodeling and metaquerying capabilities, i.e., features for specifying and reasoning about metaconcepts and metaproperties [1]. Roughly speaking, a metaconcept is a concept whose instances can be themselves concepts, and a metaproperty is a relationship between(More)
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