Data Management. Data, Data Everywhere 24th British National Confere

BNCOD has, for the past 27 years, provided a forum for researchers world-wide to gather to discuss the topical issues in databaseresearch.As the researchch- lenges have evolved, so BNCOD has changed its topics of interest accordingly, now covering data ma

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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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Richard Cooper Jessie Kennedy (Eds.)

Data Management Data, Data Everywhere 24th British National Conference on Databases, BNCOD 24 Glasgow, UK, July 3-5, 2007 Proceedings

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Volume Editors Richard Cooper University of Glasgow Dept. of Computing Science 17 Lilybank Gardens, Glasgow G12 8QQ, UK E-mail: [email protected] Jessie Kennedy Napier University School of Computing 10 Colinton Road, Edinburgh, EH10 5DT, UK E-mail: [email protected]

Library of Congress Control Number: 2007929676 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 3-540-73389-2 Springer Berlin Heidelberg New York 978-3-540-73389-8 Springer Berlin Heidelberg New York

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Preface

BNCOD has, for the past 27 years, provided a forum for researchers world-wide to gather to discuss the topical issues in database research. As the research challenges have evolved, so BNCOD has changed its topics of interest accordingly, now covering data management more widely. In doing so, it has evolved from a local conference mostly attended by British researchers to a truly international conference that happens to be held in Britain. This year, for instance, significantly less than half of the presentations are from UK or Irish authors, other contributions co