412 search results - page 16 / 83 » Aggregate queries over ontologies |
AAAI
2007
13 years 11 months ago
2007
Efficient query answering over ontologies is one of the most useful and important services to support Semantic Web applications. Approximation has been identified as a potential...
CORR
2007
Springer
13 years 9 months ago
2007
Springer
We address the problem of answering Web ontology queries efficiently. An ontology is formalized as a Deductive Ontology Base (DOB), a deductive database that comprises the ontology...
SSDBM
2006
IEEE
14 years 3 months ago
2006
IEEE
We consider an environment where a subscription system continuously evaluates pattern-based requests over unbounded sequential data. We propose an extension of the traditional pat...
SAC
2008
ACM
13 years 8 months ago
2008
ACM
We address aggregate queries over GIS data and moving object data, where non-spatial information is stored in a data warehouse. We propose a formal data model and query language t...
COMAD
2008
13 years 10 months ago
2008
Answering aggregate queries like sum, count, min, max over regions containing moving objects is often needed for virtual world applications, real-time monitoring systems, etc. Sin...