59 search results - page 12 / 12 » Rewriting Unions of General Conjunctive Queries Using Views |
ICDT
2010
ACM
14 years 1 months ago
2010
ACM
It is known that the composition of schema mappings, each specified by source-to-target tgds (st-tgds), can be specified by a secondorder tgd (SO tgd). We consider the question of...
CIKM
2010
Springer
13 years 2 months ago
2010
Springer
Schema merging is the process of consolidating multiple schemas into a unified view. The task becomes particularly challenging when the schemas are highly heterogeneous and autono...
PODS
2007
ACM
14 years 4 months ago
2007
ACM
The pebble tree automaton and the pebble tree transducer are enhanced by additionally allowing an unbounded number of `invisible' pebbles (as opposed to the usual `visible�...
WWW
2005
ACM
14 years 5 months ago
2005
ACM
Online Curriculum Portals aim to support networks of instructors and learners by providing a space of convergence for enhancing peer-to-peer learning interactions among individual...