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IJCIS
1998
116views more  IJCIS 1998»
14 years 11 months ago
Distributed Query Scheduling Service: An Architecture and Its Implementation
We present the systematic design and development of a distributed query scheduling service DQS in the context of DIOM, a distributed and interoperable query mediation system 26 ...
Ling Liu, Calton Pu, Kirill Richine
SAC
2009
ACM
15 years 4 months ago
SWOBE - embedding the semantic web languages RDF, SPARQL and SPARUL into java for guaranteeing type safety, for checking the sat
The Semantic Web and its technologies become increasingly important. As more and more Semantic Web applications are being used, developing more stable Semantic Web applications be...
Sven Groppe, Jana Neumann, Volker Linnemann
ESWS
2010
Springer
14 years 10 months ago
Modeling and Querying Metadata in the Semantic Sensor Web: The Model stRDF and the Query Language stSPARQL
Abstract. RDF will often be the metadata model of choice in the Semantic Sensor Web. However, RDF can only represent thematic metadata and needs to be extended if we want to model ...
Manolis Koubarakis, Kostis Kyzirakos
ICDE
2001
IEEE
128views Database» more  ICDE 2001»
16 years 1 months ago
Counting Twig Matches in a Tree
We describe efficient algorithms for accurately estimating the number of matches of a small node-labeled tree, i.e., a twig, in a large node-labeled tree, using a summary data str...
Zhiyuan Chen, H. V. Jagadish, Flip Korn, Nick Koud...
ICDE
2007
IEEE
117views Database» more  ICDE 2007»
16 years 1 months ago
Unnesting Scalar SQL Queries in the Presence of Disjunction
Optimizing nested queries is an intricate problem. It becomes even harder if in a nested query the linking predicate or the correlation predicate occurs disjunctively. We present ...
Matthias Brantner, Norman May, Guido Moerkotte