Finding Successful Queries in a Mediator Context
Alain Bidault, Christine Froidevaux, Brigitte Safar · Flexible Query Answering Systems · 2001
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 PICSEL 1 . 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. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.