Progress in Artificial Intelligence 9th Portuguese Conference on
The Portuguese Association for Arti cial Intelligence (APPIA) has been re- larly organising the Portuguese Conference on Arti cial Intelligence (EPIA). This ninth conference follows previous ones held in Porto (1985), Lisboa (1986), Braga (1987), Lisboa (
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Lecture Notes in Computer Science Edited by G. Goos, J. Hartmanis and J. van Leeuwen
1695
3 Berlin Heidelberg New York Barcelona Hong Kong London Milan Paris Singapore Tokyo
Pedro Barahona Jos´e J. Alferes (Eds.)
Progress in Artificial Intelligence 9th Portuguese Conference on Artificial Intelligence, EPIA ’99 ´ Evora, Portugal, September 21-24, 1999 Proceedings
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Series Editors Jaime G. Carbonell, Carnegie Mellon University, Pittsburgh, PA, USA J¨org Siekmann, University of Saarland, Saarbr¨ucken, Germany Volume Editors Pedro Barahona Universidade Nova de Lisboa, Departamento de Inform´atica Quinta da Torre, P-2825-114 Caparica, Portugal E-mail: [email protected] Jos´e J. Alferes ´ Universidade de Evora, Departamento de Matem´atica ´ R. Rom˜ao Ramalho 59, P-7000 Evora, Portugal E-mail: [email protected]
Cataloging-in-Publication data applied for Die Deutsche Bibliothek - CIP-Einheitsaufnahme Progress in artificial intelligence : proceedings / 9th Portuguese Conference on ´ Artificial Intelligence, EPIA ’99, Evora, Portugal, September 22 - 24, 1999. Pedro Barahona ; Jos´e J. Alferes (ed.). - Berlin ; Heidelberg ; New York ; Barcelona ; Hong Kong ; London ; Milan ; Paris ; Singapore ; Tokyo : Springer, 1999 (Lecture notes in computer science ; Vol. 1695 : Lecture notes in artificial intelligence) ISBN 3-540-66548-X
CR Subject Classification (1998): I.2 ISBN 3-540-66548-X Springer-Verlag Berlin Heidelberg New York This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in any other way, and storage in data banks. Duplication of this publication or parts thereof is permitted only under the provisions of the German Copyright Law of September 9, 1965, in its current version, and permission for use must always be obtained from Springer-Verlag. Violations are liable for prosecution under the German Copyright Law. c Springer-Verlag Berlin Heidelberg 1999 Printed in Germany
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Preface The Portuguese Association for Artificial Intelligence (APPIA) has been regularly organising the Portuguese Conference on Artificial Intelligence (EPIA). This ninth conference follows previous ones held in Porto (1985), Lisboa (1986), Braga (1987), Lisboa (1989), Albufeira (1991), Porto (1993), Funchal (1995) and Coimbra (1997). Starting in 1989, the conferences have been held biennially (alternating with an APPIA Advanced School on Artificial Intelligence) and become truly international: English has been adopted as the official language and the proceedings are published in Springer’s LNAI series. The conference has reconfirmed its high international standard this year, largely due to its programme committee, composed of distinguished researchers in a variety of specialities in Artificial Intelligence, half of them from Portuguese universitie
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