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KR'12 Presentation of two techniques for efficient reasoning and query answering in DLLite (OWL 2 QL).
First, Semantic Index, a technique to store triples (ABoxes) in a way that already encodes all the entailments of the ontology (RDFS or OWL 2 QL) in the backend, allowing for reasoning without exponential rewritings or forward chaining. The technique can easily be used to construct very efficient triple stores with inference support.
Second, a TBox optimisation technique that allows to obtain simpler TBoxes when the triples (ABoxes) satisfy a set of constraints.
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