潜在规则的扩展无环性概念(\emph{long version})
Extending Acyclicity Notions for Existential Rules (\emph{long version})
摘要:
已经提出了用于表示本体知识的潜在规则,特别是在基于本体的查询分类的上下文中。存在规则的蕴涵是不可判定的。我们专注于在本文中的条件,确保终止的宽度优先的前向链接算法被称为追逐。首先,我们提出了一个新的工具,允许扩展现有的非循环条件,确保追逐终止,同时保持良好的复杂性属性。其次,我们考虑了稳定模型语义下非单调否定的存在规则的扩展,并进一步扩展了正情况下的非循环性结果。
英文摘要:
Existential rules have been proposed for representing ontological knowledge, specifically in the context of Ontology-Based Query Answering. Entailment with existential rules is undecidable. We focus in this paper on conditions that ensure the termination of a breadth-first forward chaining algorithm known as the chase. First, we propose a new tool that allows to extend existing acyclicity conditions ensuring chase termination, while keeping good complexity properties. Second, we consider the extension to existential rules with nonmonotonic negation under stable model semantics and further extend acyclicity results obtained in the positive case.
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