710 search results - page 27 / 142 » Relational Expressive Power of Constraint Query Languages |
DATESO
2008
13 years 9 months ago
2008
Presently, there is no specialized language for complex integrity constraints description in XML documents. In this paper we present a language that combines first-order logic toge...
DBPL
1995
Springer
13 years 11 months ago
1995
Springer
We study the problem of maintaining recursively-de ned views, such as the transitive closure of a relation, in traditional relational languages that do not have recursion mechanis...
SIGMOD
2004
ACM
14 years 7 months ago
2004
ACM
We study the problem of answering queries through a target schema, given a set of mappings between one or more source schemas and this target schema, and given that the data is at...
ALT
2003
Springer
14 years 4 months ago
2003
Springer
A pattern is a finite string of constant and variable symbols. The erasing language generated by a pattern p is the set of all strings that can be obtained by substituting (possib...
SOFSEM
2010
Springer
14 years 4 months ago
2010
Springer
Abstract. This article introduces KWQL, spoken “quickel”, a rulebased query language for a semantic wiki based on the label-keyword query paradigm. KWQL allows for rich combine...