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2017 | OriginalPaper | Buchkapitel

More on the Data Complexity of Answering Ontology-Mediated Queries with a Covering Axiom

verfasst von : Olga Gerasimova, Stanislav Kikot, Vladimir Podolskii, Michael Zakharyaschev

Erschienen in: Knowledge Engineering and Semantic Web

Verlag: Springer International Publishing

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Abstract

We report on our recent results in the ongoing attempts to classify conjunctive queries (CQs) \({\varvec{q}}\) according to the data complexity of answering ontology-mediated queries of the form \((\{A \sqsubseteq F \sqcup T\},{\varvec{q}})\). In particular, we present new families of path CQs for which this problem is NL-, P- or coNP-complete.

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Fußnoten
2
The OMQ \({{\varvec{Q}}= (\mathcal {D}{is}_\top , {\varvec{q}})}\) with this CQ \({\varvec{q}}\) can be interpreted as follows, assuming that F stands for ‘female’, T for ‘male’, \(\top \) for all the individuals of the domain in question, and R for the ‘follows’ relation: given a graph of Twitter users, in which the gender may be specified for some nodes and missing for the other ones, check whether there certainly exist two people (nodes) in the graph of different gender who follow each other.
 
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Metadaten
Titel
More on the Data Complexity of Answering Ontology-Mediated Queries with a Covering Axiom
verfasst von
Olga Gerasimova
Stanislav Kikot
Vladimir Podolskii
Michael Zakharyaschev
Copyright-Jahr
2017
DOI
https://doi.org/10.1007/978-3-319-69548-8_11

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