64 search results - page 4 / 13 » View-Based Query Answering and Query Containment over Semist... |
DLOG
2006
13 years 8 months ago
2006
The novel context of accessing and querying large data repositories through ontologies that are formalized in terms of expressive DLs requires on the one hand to consider query an...
ICDE
2007
IEEE
14 years 8 months ago
2007
IEEE
Skyline query processing has received considerable attention in the recent past. Mainly, the skyline query is used to find a set of non dominated data points in a multidimensional...
ICDE
2004
IEEE
14 years 8 months ago
2004
IEEE
XML and other types of semi-structured data are typically represented by a labeled directed graph. To speed up path expression queries over the graph, a variety of structural inde...
IJCAI
2007
13 years 8 months ago
2007
Conjunctive queries play an important role as an expressive query language for Description Logics (DLs). Although modern DLs usually provide for transitive roles, conjunctive quer...
ICDE
2011
IEEE
12 years 10 months ago
2011
IEEE
— In this paper, we study the problem of efficiently computing multiple aggregation queries over a data stream. In order to share computation, prior proposals have suggested ins...