265 search results - page 18 / 53 » Logical Queries over Views: Decidability and Expressiveness |
BTW
2003
Springer
15 years 3 months ago
2003
Springer
Abstract:The W3C XML Linking Language (XLink) provides a powerful means for interlinking XML documents all over the world. While the effects when browsing through linked XML docume...
AAAI
2006
14 years 11 months ago
2006
We consider the problem of rewriting a query efficiently using materialized views. In the context of information integration, this problem has received significant attention in th...
ADBIS
1997
Springer
15 years 2 months ago
1997
Springer
A graphical formalized language is proposed for specifying systems of views over database schemas. The language is based on the notion of arrow (mapping) between data schemas and ...
IDEAS
2007
IEEE
15 years 4 months ago
2007
IEEE
In this paper we study the problem of deciding whether a regular path query over views in data-integration systems can be re-expressed without recursion. The problem becomes chall...
CACM
1998
14 years 9 months ago
1998
abstraction for modeling these problems is to view the Web as a collection of (usually small and heterogeneous) databases, and to view programs that extract and process Web data au...