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Rewritability in Monadic Disjunctive Datalog, MMSNP, and Expressive Description Logics

Cristina Feier ; Antti Kuusisto ; Carsten Lutz.

We study rewritability of monadic disjunctive Datalog programs, (the complements of) MMSNP sentences, and ontology-mediated queries (OMQs) based on expressive description logics of the ALC family and on conjunctive queries. We show that rewritability into FO and into monadic Datalog (MDLog) are&nbsp;[&hellip;]

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Answer Counting under Guarded TGDs

Cristina Feier ; Carsten Lutz ; Marcin Przybyłko.

We study the complexity of answer counting for ontology-mediated queries and for querying under constraints, considering conjunctive queries and unions thereof (UCQs) as the query language and guarded TGDs as the ontology and constraint language, respectively. Our main result is a classification&nbsp;[&hellip;]

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