162 search results - page 9 / 33 » SPARQL query rewriting for implementing data integration ove... |
VLDB
2007
ACM
14 years 7 months ago
2007
ACM
The performance of XML database queries can be greatly enhanced by rewriting them using materialized views. We study the problem of rewriting a query using materialized views, whe...
NETWORKING
2004
13 years 8 months ago
2004
The most widespread Wireless Local Area Networks (WLANs) are based today on the IEEE 802.11 standard and its various versions, especially the IEEE 802.11b. In this article we first...
EDBT
2002
ACM
14 years 7 months ago
2002
ACM
The problem of finding contained rewritings of queries using views is of great importance in mediated data integration systems. In this paper, we first present a general approach f...
ADBIS
2000
Springer
13 years 12 months ago
2000
Springer
Queries involving aggregation are typical in a number of database research areas, such as data warehousing, global information systems and mobile computing. One of the main ideas ...
ACMSE
2005
ACM
14 years 1 months ago
2005
ACM
A simple extension to the relational model that permits metadata (more generally metaknowledge) to be stored and manipulated as first class data is proposed. The accompanying que...