Database and XML Technologies Second International XML Database Symp

Modern database systems enhance the capabilities of traditional database systems by their ability to handle any kind of data, including text, image, audio, and video. Today, databasesystemsareparticularlyrelevanttotheWeb,astheycanprovideinputtocontent gen

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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 New York University, NY, 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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Zohra Bellahsène Tova Milo Michael Rys Dan Suciu Rainer Unland (Eds.)

Database and XML Technologies Second International XML Database Symposium, XSym 2004 Toronto, Canada, August 29-30, 2004 Proceedings

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Volume Editors Zohra Bellahsène LIRMM UMR 5506 CNRS/Université Montpellier II 161 Rue Ada, 34392 Montpellier, France E-mail: [email protected] Tova Milo Tel Aviv University, Computer Science Department Tel Aviv 69978, Israel E-mail: [email protected] Michael Rys Microsoft Corporation One Microsoft Way, Redmond, WA 98052, USA E-mail: [email protected] Dan Suciu University of Washington, Computer Science and Engineering Box 352350, Seattle, WA 98195-2350, USA E-mail: [email protected] Rainer Unland University of Duisburg-Essen Institute for Computer Science and Business Informations Systems (ICB) Practical Computer Science, especially Data Management Systems and Knowledge Representation Schützenbahn 70, 45117 Essen, Germany E-mail: [email protected]

Library of Congress Control Number: 2004110717 CR Subject Classification (1998): H.2, H.3, H.4, D.2, C.2.4 ISSN 0302-9743 ISBN 3-540-22969-8 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 springeronline.com © Springer-Verlag Berlin Heidelberg 2004 Printed in Germany Typesetting: Camera-ready by author, data conversion by PTP-Berlin, Protago-TeX-Production GmbH Printed on acid-free paper SPIN: 11317616 06/3142 543210

Preface

Modern database systems enhance the capabilities of traditional database systems by their ability to handle any kind of data, including text, image, audio, and video. Today, database systems are pa