269 search results - page 19 / 54 » On Tree Pattern Query Rewriting Using Views |
122
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SEMWEB
2010
Springer
14 years 11 months ago
2010
Springer
Abstract. In order to effectively and quickly answer queries in environments with distributed RDF/OWL, we present a query optimization algorithm to identify the potentially relevan...
144
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CACM
1998
15 years 1 months ago
1998
abstraction for modeling these problems is to view the Web as a collection of (usually small and heterogeneous) databases, and to view programs that extract and process Web data au...
225
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ICDE
2006
IEEE
16 years 3 months ago
2006
IEEE
We consider the problem of creating a sample view of a database table. A sample view is an indexed, materialized view that permits efficient sampling from an arbitrary range query...
125
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GG
2004
Springer
15 years 7 months ago
2004
Springer
Refactorings are transformations that change the structure of a program, while preserving the behavior. The topic has attracted a lot of attention recently, since it is a promising...
136
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CSFW
2003
IEEE
15 years 7 months ago
2003
IEEE
SPKI/SDSI is a language for expressing distributed access control policy, derived from SPKI and SDSI. We provide a first-order logic (FOL) semantics for SDSI, and show that it ha...