Flexible Query Answering Systems 9th International Conference, F

This book constitutes the refereed proceedings of the 8th International Conference on Flexible Query Answering Systems, FQAS 2011, held in Roskilde, Denmark, in October 2011. The 43 papers included in this volume were carefully reviewed and selected from

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NAI Founding Series Editor Joerg Siekmann DFKI and Saarland University, Saarbrücken, Germany

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Henning Christiansen Guy De Tré Adnan Yazici Slawomir Zadrozny Troels Andreasen Henrik Legind Larsen (Eds.)

Flexible Query Answering Systems 9th International Conference, FQAS 2011 Ghent, Belgium, October 26-28, 2011 Proceedings

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Series Editors Randy Goebel, University of Alberta, Edmonton, Canada Jörg Siekmann, University of Saarland, Saarbrücken, Germany Wolfgang Wahlster, DFKI and University of Saarland, Saarbrücken, Germany Volume Editors Henning Christiansen Roskilde University, Denmark, E-mail: [email protected] Guy De Tré Ghent University, Belgium, E-mail: [email protected] Adnan Yazici Middle East Technical University (METU), Ankara, Turkey E-mail: [email protected] Slawomir Zadrozny Polish Academy of Science, Warsaw, Poland E-mail: [email protected] Troels Andreasen Roskilde University, Denmark, E-mail: [email protected] Henrik Legind Larsen Aalborg University, Esbjerg, Denmark, E-mail: [email protected]

ISSN 0302-9743 e-ISSN 1611-3349 ISBN 978-3-642-24763-7 e-ISBN 978-3-642-24764-4 DOI 10.1007/978-3-642-24764-4 Springer Heidelberg Dordrecht London New York Library of Congress Control Number: 2011938238 CR Subject Classification (1998): I.2, H.3, H.2, H.4, H.5 LNCS Sublibrary: SL 7 – Artificial Intelligence © Springer-Verlag Berlin Heidelberg 2011 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. Violations are liable to prosecution under the German Copyright Law. The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com)

Preface

This volume contains the papers presented at the 9th International Conference on Flexible Query Answering Systems, FQAS 2011, held in Ghent, Belgium, October 26–28, 2011. This biennial conference series has been running since 1994, starting in Roskilde, Denmark, where it was held also in 1996, 1998, and 2009; in 2000 it was held in Warsaw, Poland; in 2002 in Copenhagen, Denmark; in 2004 in Lyon, France; and in 2006 in Milan, Italy. FQAS has become the premier conference concerned with the very important issue of providing users of information systems with flexible querying capabilities, and with easy and intuit