Flexible Query Answering Systems

Edited by Troels Andreasen, Henning Christiansen, Henrik Legind Larsen
Department of Computer Science
Roskilde University, P.O.Box 260, DK-4000 Roskilde, Denmark


Preface ..... vii

Introduction ..... ix

1 Not all answers are equally good: Estimating the quality of database answers
Amihai Motro, Igor Rakov ..... 1

2 Fuzzy query language for hypothesis evaluation
Dan Rasmussen, Ronald R. Yager ..... 23

3 Using fuzzy sets in flexible querying: Why and how?
Didier Dubois, Henri Prade ..... 45

4 Nonstandard database interaction from metalogic programming
Troels Andreasen, Henning Christiansen ..... 61

5 A fuzzy deductive relational database
O. Pons, J. M. Medina, J. C. Cubero, M. A. Vila ..... 79

6 Metareasoning agents for query-answering systems
Jonas Barklund, Pierangelo Dell'Acqua, Stefania Costantini,\\Gaetano A. Lanzarone ..... 103

7 Fuzzy querying in a concept object algebraic datamodel
Henrik Legind Larsen, Jørgen Fischer Nilsson ..... 123

8 Flexible query-answering in a group of databases
Laurence Cholvy ..... 141

9 Fuzzy time indications in natural languages interfaces
R. De Caluwe, B. Van der Cruyssen, G. De Tré, F. Devos, P. Maesfranckx ..... 163

10 Fuzzy queries against regular and fuzzy databases
Patrick Bosc, Olivier Pivert ..... 187

11 Answering queries about validity and completeness of data: From modal logic to relational algebra
Robert Demolombe ..... 209

12 Constructing aggregation functions using fuzzy modeling
Ronald R. Yager ..... 227

13 Flexible querying using fuzzy logic: An implementation for Microsoft Access
Janusz Kacprzyk, Slawomir Zadro ..... 247

14 Fuzzy decision trees and databases
Bernadette Bouchon-Meunier, Christophe Marsala ..... 277