1004 search results - page 152 / 201 » Safe Constraint Queries |
CSL
2009
Springer
14 years 18 days ago
2009
Springer
We introduce tree-width for first order formulae , fotw(). We show that computing fotw is fixed-parameter tractable with parameter fotw. Moreover, we show that on classes of formul...
CSFW
2004
IEEE
14 years 14 days ago
2004
IEEE
We study the specification of access control policy in large-scale distributed systems. We present Cassandra, a language and system for expressing policy, and the results of a sub...
BTW
2007
Springer
14 years 22 days ago
2007
Springer
: Schema mapping techniques for data exchange have become popular and useful tools both in research and industry. A schema mapping relates a source schema with a target schema via ...
PVLDB
2008
13 years 8 months ago
2008
Despite the intense interest towards realizing the Semantic Web vision, most existing RDF data management schemes are constrained in terms of efficiency and scalability. Still, th...
ICDT
2009
ACM
14 years 3 months ago
2009
ACM
Managing inconsistency in databases has long been recognized as an important problem. One of the most promising approaches to coping with inconsistency in databases is the framewo...