83 search results - page 10 / 17 » Tractable Query Answering over Ontologies with Datalog - |
117
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TSC
2010
14 years 5 months ago
2010
Data-Providing (DP) services allow query-like access to organizations' data via web services. The invocation of a DP service results in the execution of a query over data sour...
CORR
2007
Springer
14 years 10 months ago
2007
Springer
We address the problem of answering Web ontology queries efficiently. An ontology is formalized as a Deductive Ontology Base (DOB), a deductive database that comprises the ontology...
103
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CORR
2011
Springer
14 years 5 months ago
2011
Springer
Contemporary use of the term ’intension’ derives from the traditional logical doctrine that an idea has both an extension and an intension. In this paper we introduce an intens...
106
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ICDT
2012
ACM
13 years 1 months ago
2012
ACM
In a recent paper by Hellerstein [15], a tight relationship was conjectured between the number of strata of a Datalog¬ program and the number of “coordination stages” require...
KR
2010
Springer
15 years 3 months ago
2010
Springer
Ontologies can be used to provide an enriched vocabulary for the formulation of queries over instance data. We identify query emptiness and predicate emptiness as two central reas...