From Conjunctive Queries to Instance Queries in Ontology-Mediated Querying

@inproceedings{Feier2018FromCQ,
  title={From Conjunctive Queries to Instance Queries in Ontology-Mediated Querying},
  author={Cristina Feier and Carsten Lutz and Frank Wolter},
  booktitle={IJCAI},
  year={2018}
}
We consider ontology-mediated queries (OMQs) based on expressive description logics of the ALC family and (unions) of conjunctive queries, studying the rewritability into OMQs based on instance queries (IQs). Our results include exact characterizations of when such a rewriting is possible and tight complexity bounds for deciding rewritability. We also give a tight complexity bound for the related problem of deciding whether a given MMSNP sentence (in other words: the complement of a monadic… 
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