412 search results - page 44 / 83 » Aggregate queries over ontologies |
SIGMOD
2004
ACM
14 years 10 months ago
2004
ACM
Many algorithms have been proposed to approximate holistic aggregates, such as quantiles and heavy hitters, over data streams. However, little work has been done to explore what t...
OTM
2007
Springer
14 years 4 months ago
2007
Springer
Abstract. This paper presents a comparison of performance of various triplestore technologies currently in either production release or beta test. Our comparison of triple-store te...
AAMAS
2011
Springer
13 years 4 months ago
2011
Springer
We study the case where agents have preferences over ranges (intervals) of values, and we wish to elicit and aggregate these preferences. For example, consider a set of climatologi...
SAMT
2007
Springer
14 years 4 months ago
2007
Springer
—The vision of the Semantic Web is to lift the current Web into semantic repositories where heterogeneous data can be queried and different services can be mashed up. Ontology or...
ICDT
2010
ACM
14 years 4 days ago
2010
ACM
When a query is evaluated under bag semantics, each answer is returned as many times as it has derivations. Bag semantics has long been recognized as important, especially when ag...