A general datalog-based framework for tractable query answering over ontologies.
In this paper, we introduce a family of expressive extensions of Datalog, called Datalog±, as a new paradigm for query answering over ontologies. The Datalog± family admits existentially quantified variables in rule heads, and has suitable restrictions to ensure highly efficient ontology querying. W...
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| Format: | Journal article |
| Sprache: | English |
| Veröffentlicht: |
ACM
2009
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