Finding successful queries in a mediator context

被引：0
|
作者：
Bidault, A [1 ]
Froidevaux, C [1 ]
Safar, B [1 ]
机构：
[1] CNRS, LRI, F-91405 Orsay, France
来源：
FLEXIBLE QUERY ANSWERING SYSTEMS: RECENT ADVANCES | 2001年
关键词：
D O I：
暂无
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
In this paper, we study failing queries posed to a mediator in an information integration system and expressed in the logical formalism of the information integration system PICSEL1. First, we present the notion of concept generalisation in a concept hierarchy that is used to repair failing queries. Then, we address two problems arising while rewriting a query using views. The first problem concerns queries that cannot be rewritten due to a lack of sources, the second one concerns queries that have only unsatisfiable rewritings.
引用
收藏
页码：42 / 53
页数：12
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