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ICDE
2002
IEEE
14 years 9 months ago
2002
IEEE
XML queries typically specify patterns of selection predicates on multiple elements that have some specified tree structured relationships. The primitive tree structured relations...
INFSOF
2006
13 years 7 months ago
2006
The parametric data model captures an object in terms of a single tuple. This feature eliminates unnecessary self-join operations to combine tuples scattered in a temporal relatio...
VLDB
1998
ACM
13 years 12 months ago
1998
ACM
Currently the key problems of query optimization are extensibility imposed by object-relational technology, as well as query complexity caused by forthcoming applications, such as...
ACL
2006
13 years 9 months ago
2006
At present, adapting an Information Extraction system to new topics is an expensive and slow process, requiring some knowledge engineering for each new topic. We propose a new par...
FOCS
1998
IEEE
13 years 12 months ago
1998
IEEE
This paper deals with the evaluation of acyclic Boolean conjunctive queries in relational databases. By well-known results of Yannakakis [1981], this problem is solvable in polynom...