The Semantic Web: Research and Applications 4th European Semantic We

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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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Enrico Franconi Michael Kifer Wolfgang May (Eds.)

The Semantic Web: Research and Applications 4th European Semantic Web Conference, ESWC 2007 Innsbruck, Austria, June 3-7, 2007 Proceedings

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Volume Editors Enrico Franconi Free University of Bozen–Bolzano Faculty of Computer Science Piazza Domenicani 3, 39100 Bozen-Bolzano (BZ), Italy E-mail: [email protected] Michael Kifer State University of New York at Stony Brook Department of Computer Science Stony Brook, New York, NY 11794-4400, USA E-mail: [email protected] Wolfgang May Georg-August-Universität Göttingen Institut für Informatik Lotzestrasse 16-18, 37083 Göttingen, Germany E-mail: [email protected]

Library of Congress Control Number: 2007927308 CR Subject Classification (1998): H.4, H.3, C.2, H.5, I.2, K.4, D.2 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI ISSN ISBN-10 ISBN-13

0302-9743 3-540-72666-7 Springer Berlin Heidelberg New York 978-3-540-72666-1 Springer Berlin Heidelberg New York

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Preface

The papers in this volume represent the technical program of the 4th European Semantic Web Conference, ESWC 2007, that took place June 3–7, 2007 in Innsbruck, the capital of the Tyrol region of Austria. The ESWC series of conferences is an annual, international forum for dissemination and discussion of the late