62 search results - page 6 / 13 » Query rewriting with symmetric constraints |
142
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ICDT
2009
ACM
15 years 10 months ago
2009
ACM
We study the problem of querying data sources that accept only a limited set of queries, such as sources accessible by Web services which can implement very large (potentially inf...
180
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ICDE
2006
IEEE
15 years 11 months ago
2006
IEEE
We present ACXESS (Access Control for XML with Enhanced Security Specifications), a system for specifying and enforcing enhanced security constraints on XML via virtual "secu...
DBSEC
2006
14 years 11 months ago
2006
We demonstrate how access control models and policies can be represented by using term rewriting systems, and how rewriting may be used for evaluating access requests and for provi...
VLDB
1999
ACM
15 years 1 months ago
1999
ACM
We present an optimization method and algorithm designed for three objectives: physical data independence, semantic optimization, and generalized tableau minimization. The method ...
156
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VLDB
2001
ACM
15 years 9 months ago
2001
ACM
Abstract In this paper we present a mechanism for approximately translating Boolean query constraints across heterogeneous information sources. Achieving the best translation is ch...