Advances in Information Retrieval 29th European Conference on IR Res

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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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Giambattista Amati Claudio Carpineto Giovanni Romano (Eds.)

Advances in Information Retrieval 29th European Conference on IR Research, ECIR 2007 Rome, Italy, April 2-5, 2007 Proceedings

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Volume Editors Giambattista Amati Claudio Carpineto Giovanni Romano Fondazione Ugo Bordoni Via Baldassarre Castiglione 59, 00142 Rome, Italy E-mail:{gba, carpinet, romano}@fub.it

Library of Congress Control Number: 2007923290 CR Subject Classification (1998): H.3, H.2, I.2.3, I.2.6-7, H.4, H.5.4, I.7 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI ISSN ISBN-10 ISBN-13

0302-9743 3-540-71494-4 Springer Berlin Heidelberg New York 978-3-540-71494-1 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 2007 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper SPIN: 12038824 06/3142 543210

Preface

This volume contains the papers presented at ECIR 2007, the 29th European Conference on Information Retrieval. The conference was organized by the Fondazione Ugo Bordoni (FUB), in cooperation with the Information Retrieval Specialist Group of the British Computer Society (BCS-IRSG) and the ACM Special Interest Group on Information Retrieval (ACM SIGIR). It was held during April 2–5, 2007 in Rome, hosted by the National Research Council of Italy (CNR). The conference was initially established by BCS-IRSG in the United Kingdom under the name “Annual Colloquium on Information Retrieval Research”. When the involvement of