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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Notes
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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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Acknowledgements
The work of O. Gerasimova and M. Zakharyaschev was carried out at the National Research University Higher School of Economics and supported by the Russian Science Foundation under grant 17-11-01294; the work of V. Podolskii was supported by the Russian Academic Excellence Project ‘5-100’ and by grant MK-7312.2016.1.
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Gerasimova, O., Kikot, S., Podolskii, V., Zakharyaschev, M. (2017). More on the Data Complexity of Answering Ontology-Mediated Queries with a Covering Axiom. In: Różewski, P., Lange, C. (eds) Knowledge Engineering and Semantic Web. KESW 2017. Communications in Computer and Information Science, vol 786. Springer, Cham. https://doi.org/10.1007/978-3-319-69548-8_11
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