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CLEF
2010
Springer
13 years 11 months ago
Ambiguity of Queries and the Challenges for Query Language Detection
In this paper, a sample set of 510 simple searches from the TEL action log 2009 is analyzed for query content and query language. More than half of the queries are for named entiti...
Juliane Stiller, Maria Gäde, Vivien Petras
AUSAI
2004
Springer
14 years 4 months ago
A Logic Based Approach for Dynamic Access Control
The PolicyUpdater1 system is a fully-implemented access control system that provides policy evaluations as well as dynamic policy updates. These functions are achieved by the use o...
Vino Fernando Crescini, Yan Zhang
CP
2003
Springer
14 years 4 months ago
Open Constraint Optimization
Constraint satisfaction has been applied with great success in closed-world scenarios, where all options and constraints are known from the beginning and fixed. With the internet,...
Boi Faltings, Santiago Macho-Gonzalez
ICDT
2010
ACM
161views Database» more  ICDT 2010»
14 years 8 months ago
Composition with Target Constraints
It is known that the composition of schema mappings, each specified by source-to-target tgds (st-tgds), can be specified by a secondorder tgd (SO tgd). We consider the question of...
Marcelo Arenas, Ronald Fagin, Alan Nash
CSR
2006
Springer
14 years 2 months ago
The Complexity of Equality Constraint Languages
We classify the computational complexity of all constraint satisfaction problems where the constraint language is preserved by all permutations of the domain. A constraint languag...
Manuel Bodirsky, Jan Kára