298 search results - page 13 / 60 » Query Rewriting in DL-Lite_^(HN)_horn |
104
Voted
AICOM
2004
14 years 11 months ago
2004
Abstract. We address the problem of answering queries using expressive symmetric inter-schema constraints which allow to establish mappings between several heterogeneous informatio...
185
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ICDE
2006
IEEE
16 years 11 days ago
2006
IEEE
Relational division, also known as small divide, is a derived operator of the relational algebra that realizes a many-to-one set containment test, where a set is represented as a ...
CIKM
2004
Springer
15 years 4 months ago
2004
Springer
At present, most of the state-of-the-art solutions for XML access controls are either (1) document-level access control techniques that are too limited to support fine-grained sec...
111
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BDA
2001
15 years 12 days ago
2001
A Community Web portal is a set of tools for a community of people who want to share information on a certain domain via the Web. The backbone of this system is an ontology which ...
76
Voted
CIKM
2005
Springer
15 years 4 months ago
2005
Springer
We introduce the notion of views as a mechanism for securing and providing access control in the context of XML. Research in XML has explored several efficient querying mechanism...