4382 search results - page 119 / 877 » Query by Semantic Example |
135
click to vote
ICDT
2007
ACM
15 years 8 months ago
2007
ACM
Abstract. We study containment of conjunctive queries that are evaluated over databases that may contain tuples with null values. We assume the semantics of SQL for single block qu...
123
click to vote
TMRA
2005
Springer
15 years 7 months ago
2005
Springer
Abstract. This paper describes a query algebra for tolog, a query language for Topic Maps inspired by Prolog and very similar to Datalog. The language is based on binding variables...
151
click to vote
WEBDB
2004
Springer
15 years 7 months ago
2004
Springer
Current approaches for answering queries with imprecise constraints require users to provide distance metrics and importance measures for attributes of interest. In this paper we ...
125
click to vote
TDM
2004
15 years 3 months ago
2004
Document-centric XML collections contain text-rich documents, marked up with XML tags. The tags add lightweight semantics to the text. Querying such collections calls for a hybrid...
115
click to vote
JIS
2006
15 years 2 months ago
2006
Query expansion terms are often used to enhance original query formulations in document retrieval. Such terms are usually selected from the entire documents or from windows or pas...