Combining decidability paradigms for existential rules

Georg Gottlob, Marco Manna, Andreas Pieris

Research output: Contribution to journalArticlepeer-review


Existential rules are Datalog rules extended with existential quantifiers in rule-heads. Three fundamental restriction paradigms that have been studied for ensuring decidability of query answering under existential rules are weak-acyclicity, guardedness and stickiness. Towards the identification of even more expressive decidable languages, several attempts have been conducted to consolidate weak-acyclicity with the other two paradigms. However, it is not clear how guardedness and stickiness can be merged; this is the subject of this paper. A powerful and flexible condition, called tameness, is proposed, which allows us to consolidate in an elegant and uniform way guardedness with stickiness.
Original languageEnglish
Pages (from-to)877-892
Number of pages16
Issue number4-5
Publication statusPublished - Jul 2013

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