710 search results - page 27 / 142 » Relational Expressive Power of Constraint Query Languages |
DATESO
2008
15 years 25 days 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
15 years 2 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...
105
click to vote
SIGMOD
2004
ACM
15 years 11 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
15 years 8 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
15 years 8 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...