Advances in Information Retrieval 34th European Conference on IR Res

This book constitutes the proeedings of the 34th European Conference on IR Research, ECIR 2012, held in Barcelona, Spain, in April 2012. The 37 full papers, 28 poster papers and 7 demonstrations presented in this volume were carefully reviewed and selecte

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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 Alfred Kobsa University of California, Irvine, CA, 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 TU Dortmund University, Germany Madhu Sudan Microsoft Research, Cambridge, MA, USA Demetri Terzopoulos University of California, Los Angeles, CA, USA Doug Tygar University of California, Berkeley, CA, USA Gerhard Weikum Max Planck Institute for Informatics, Saarbruecken, Germany

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Ricardo Baeza-Yates Arjen P. de Vries Hugo Zaragoza B. Barla Cambazoglu Vanessa Murdock Ronny Lempel Fabrizio Silvestri (Eds.)

Advances in Information Retrieval 34th European Conference on IR Research, ECIR 2012 Barcelona, Spain, April 1-5, 2012 Proceedings

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Volume Editors Ricardo Baeza-Yates B. Barla Cambazoglu Vanessa Murdock Yahoo! Research, Barcelona, Spain E-mail: [email protected]; {barla,vmurdock}@yahoo-inc.com Arjen P. de Vries CWI, Amsterdam, The Netherlands E-mail: [email protected] Hugo Zaragoza Websays, Barcelona, Spain E-mail: [email protected] Ronny Lempel Yahoo! Labs, Haifa, Israel E-mail: [email protected] Fabrizio Silvestri ISTI-CNR, Pisa, Italy E-mail: [email protected]

ISSN 0302-9743 e-ISSN 1611-3349 e-ISBN 978-3-642-28997-2 ISBN 978-3-642-28996-5 DOI 10.1007/978-3-642-28997-2 Springer Heidelberg Dordrecht London New York Library of Congress Control Number: 2012933583 CR Subject Classification (1998): H.3, H.2, I.2, H.4, H.2.8, I.7, H.5 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI

© Springer-Verlag Berlin Heidelberg 2012 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

These proceedings contain the high-q