Loop Restricted Existential Rules and First-order Rewritability for Query Answering

19 Apr 2018 Vernon Asuncion Yan Zhang Heng Zhang Yun Bai Weisheng Si

In ontology-based data access (OBDA), the classical database is enhanced with an ontology in the form of logical assertions generating new intensional knowledge. A powerful form of such logical assertions is the tuple-generating dependencies (TGDs), also called existential rules, where Horn rules are extended by allowing existential quantifiers to appear in the rule heads... (read more)

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