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G. Berger, A. Pieris:
"Ontology-Mediated Queries Distributing over Components";
Vortrag: Twenty-Fifth International Joint Conference on Artificial Intelligence - IJCAI 2016, New York, NY, USA; 09.07.2016 - 15.07.2016; in: "Proceedings of the Twenty-Fifth International Joint Conference on Artificial Intelligence, IJCAI 2016, New York, NY, USA, 9-15 July 2016", S. Kambhampati (Hrg.); IJCAI/AAAI Press, (2016), ISBN: 978-1-57735-770-4; S. 943 - 949.

Ontology-based data access is concerned with the problem of querying incomplete data sources in the presence of an ontology. A key notion in this setting is that of ontology-mediated query, which is a database query coupled with an ontology. An interesting issue is whether the answer to an ontology-mediated query can be computed by parallelizing it over the connected components of the database, i.e., whether the query distributes over components. This allows us to evaluate the query in a distributed and coordination-free manner. We investigate distribution over components for classes of ontology-mediated queries where the database query is a conjunctive query and the ontology is formulated using existential rules. For each such class, we syntactically characterize its fragment that distributes over components, and we study the problem of deciding whether a query distributes over components.

http://www.ijcai.org/Proceedings/16/Papers/138.pdf

Projektleitung Reinhard Pichler:
Heterogene Information Integration

Projektleitung Reinhard Pichler:
SEE: SPARQL Evaluation and Extensions

Projektleitung Stefan Woltran:
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