151 search results - page 25 / 31 » Materializing views with minimal size to answer queries |
DLOG
2011
13 years 1 months ago
2011
Query answering in Ontology Based Data Access (OBDA) exploits the knowledge of an ontology’s TBox to deal with incompleteness of the ABox (or data source). Current query-answerin...
ALT
2009
Springer
14 years 6 months ago
2009
Springer
Abstract. We analyze the expected cost of a greedy active learning algorithm. Our analysis extends previous work to a more general setting in which different queries have differe...
GG
2004
Springer
14 years 3 months ago
2004
Springer
Abstract. In the context of graph transformation we look at the operation of switching, which can be viewed as an elegant method for realizing global transformations of (group-labe...
SIGMOD
2004
ACM
14 years 9 months ago
2004
ACM
Increasing popularity of XML in recent years has generated much interest in query processing over graph-structured data. To support efficient evaluation of path expressions, many ...
FOIKS
2004
Springer
14 years 1 months ago
2004
Springer
When two or more databases are combined into a global one, integrity may be violated even when each database is consistent with its own local integrity constraints. Efficient metho...