710 search results - page 31 / 142 » Relational Expressive Power of Constraint Query Languages |
ER
2004
Springer
14 years 1 months ago
2004
Springer
In this paper, we develop a novel Web Usage Manipulation Language (WUML) which is a declarative language for manipulating Web log data. We assume that a set of trails formed by use...
POLICY
2004
Springer
14 years 1 months ago
2004
Springer
We study the specification of access control policy in large-scale distributed systems. Our work on real-world policies has shown that standard policy idioms such as role hierarc...
ICDT
2009
ACM
14 years 8 months ago
2009
ACM
The need to manage diverse information sources has triggered the rise of very loosely structured data models, known as "dataspace models." Such information management sy...
EACL
1989
ACL Anthology
13 years 8 months ago
1989
ACL Anthology
This paper shows how higher levels of generalization can be introduced into unification grammars by exploiting methods for typing grammatical objects. We discuss the strategy of u...
VLDB
1997
ACM
13 years 12 months ago
1997
ACM
Information integration systems have to cope with the different and limited query interfaces of the underlying information sources. First, the integration systems need description...