Flexible and Efficient Information Handling 23rd British National Co

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Editorial Board David Hutchison Lancaster University, UK Takeo Kanade Carnegie Mellon University, Pittsburgh, PA, USA Josef Kittler University of Surrey, Guildford, UK Jon M. Kleinberg Cornell University, Ithaca, NY, USA Friedemann Mattern ETH Zurich, Switzerland John C. Mitchell Stanford University, CA, USA Moni Naor Weizmann Institute of Science, Rehovot, Israel Oscar Nierstrasz University of Bern, Switzerland C. Pandu Rangan Indian Institute of Technology, Madras, India Bernhard Steffen University of Dortmund, Germany Madhu Sudan Massachusetts Institute of Technology, MA, USA Demetri Terzopoulos University of California, Los Angeles, CA, USA Doug Tygar University of California, Berkeley, CA, USA Moshe Y. Vardi Rice University, Houston, TX, USA Gerhard Weikum Max-Planck Institute of Computer Science, Saarbruecken, Germany

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David Bell Jun Hong (Eds.)

Flexible and Efficient Information Handling 23rd British National Conference on Databases, BNCOD 23 Belfast, Northern Ireland, UK, July 18-20, 2006 Proceedings

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Volume Editors David Bell Jun Hong Queen’s University Belfast School of Electronics, Electrical Engineering and Computer Science Belfast BT7 1NN, UK E-mail:{da.bell, j.hong}@qub.ac.uk

Library of Congress Control Number: 2006928025 CR Subject Classification (1998): H.2, H.3, H.4 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI ISSN ISBN-10 ISBN-13

0302-9743 3-540-35969-9 Springer Berlin Heidelberg New York 978-3-540-35969-2 Springer 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. Violations are liable to prosecution under the German Copyright Law. Springer is a part of Springer Science+Business Media springer.com © Springer-Verlag Berlin Heidelberg 2006 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper SPIN: 11788911 06/3142 543210

Preface

Since 1980, BNCOD conferences have provided an opportunity for researchers to present and discuss advances in research on database systems and in the deployment of database technology. Contributions have been made to the plotting of new directions in the development of the technology and in the exploration of opportunities and challenges. The Programme Committee of BNCOD 2006 sought to continue this pattern, and this year we chose to place special emphasis on “flexibility and performance.” The idea is to look at challenges and developments from these two complementary and sometimes competitive directions. In practice, there is often a ‘tigh