7576 search results - page 348 / 1516 » On Querying Ontologies and Databases |
186
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CIKM
2009
Springer
16 years 1 months ago
2009
Springer
Ontology-Based Information Extraction (OBIE) has recently emerged as a subfield of Information Extraction (IE). Here, ontologies - which provide formal and explicit specificatio...
153
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ER
2007
Springer
16 years 1 months ago
2007
Springer
Although OWL provides a solid basis for many semantic-web applications, it lacks sufficient declarative semantics for instance recognition. This omission prevents OWL from being a ...
211
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SEMWEB
2010
Springer
15 years 1 months ago
2010
Springer
The Semantic Web emphasizes encoding over modeling. It is built on the premise that ontology engineers can say something useful about the semantics of vocabularies by expressing th...
318
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ICDE
2007
IEEE
16 years 8 months ago
2007
IEEE
Optimizing nested queries is an intricate problem. It becomes even harder if in a nested query the linking predicate or the correlation predicate occurs disjunctively. We present ...
260
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VLDB
2009
ACM
16 years 7 months ago
2009
ACM
We consider the problem of using sampling to estimate the result of an aggregation operation over a subset-based SQL query, where a subquery is correlated to an outer query by a NO...