2043 search results - page 21 / 409 » The Limits of Querying Ontologies |
VLDB
1999
ACM
14 years 27 days ago
1999
ACM
XML is fast emerging as the dominant standard for representing data in the World Wide Web. Sophisticated query engines that allow users to effectively tap the data stored in XML d...
ER
2004
Springer
14 years 2 months ago
2004
Springer
This paper uses a knowledge-based approach to querying heterogeneous spatial databases based on an ontology and conceptual and attribute similarities. The ontology, which may be in...
ISTA
2003
13 years 10 months ago
2003
: Reported is the methodology of the semantic transformation of an initial user’s search query in the form of key words or key phrases to the resulting query composed of the rele...
ICDE
2001
IEEE
14 years 10 months ago
2001
IEEE
We study the problem of approximately answering aggregation queries using sampling. We observe that uniform sampling performs poorly when the distribution of the aggregated attrib...
BNCOD
2001
13 years 10 months ago
2001
Abstract. Integrating, cleaning and analyzing data from heterogeneous sources is often complicated by the large amounts of data and its physical distribution which can result in po...