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  • 标题:Rewritability in Monadic Disjunctive Datalog, MMSNP, and Expressive Description Logics (Invited Talk)
  • 本地全文:下载
  • 作者:Cristina Feier ; Antti Kuusisto ; Carsten Lutz
  • 期刊名称:LIPIcs : Leibniz International Proceedings in Informatics
  • 电子版ISSN:1868-8969
  • 出版年度:2017
  • 卷号:68
  • 页码:1:1-1:17
  • DOI:10.4230/LIPIcs.ICDT.2017.1
  • 出版社:Schloss Dagstuhl -- Leibniz-Zentrum fuer Informatik
  • 摘要: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 decidable, and that rewritability into Datalog is decidable when the original query satisfies a certain condition related to equality. We establish 2NExpTime-completeness for all studied problems except rewritability into MDLog for which there remains a gap between 2NExpTime and 3ExpTime. We also analyze the shape of rewritings, which in the MMSNP case correspond to obstructions, and give a new construction of canonical Datalog programs that is more elementary than existing ones and also applies to non-Boolean queries.
  • 关键词:FO-Rewritability; MDDLog; MMSNP; DL; ontology mediated queries
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