E-Commerce and Web Technologies 6th International Conference, EC-Web

We welcome you to the 6th International Conference on E-Commerce and Web Technology (EC-Web 2005) held in Copenhagen, Denmark. It was held in conjunction with DEXA 2005. This conference was organized for the first time in Greenwich, UK, in 2000, and it ha

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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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Kurt Bauknecht Birgit Pröll Hannes Werthner (Eds.)

E-Commerce and Web Technologies 6th International Conference, EC-Web 2005 Copenhagen, Denmark, August 23-26, 2005 Proceedings

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Volume Editors Kurt Bauknecht University of Zurich, Department of Informatics (IFI) Winterthurer Str. 190, 8057 Zurich, Switzerland E-mail: baukn@ifi.unizh.ch Birgit Pröll Johannes Kepler University, Institute for Applied Knowledge Processing (FAW) Softwarepark Hagenberg, 4232 Hagenberg, Austria E-mail: [email protected] Hannes Werthner Leopold Franzens University, Department for Information Systems, e-tourism (ISET) Universitätsstr. 15, 6020 Innsbruck, Austria E-mail: [email protected]

Library of Congress Control Number: 2005930718 CR Subject Classification (1998): H.4, K.4.4, J.1, K.5, H.3, H.2, K.6.5 ISSN ISBN-10 ISBN-13

0302-9743 3-540-28467-2 Springer Berlin Heidelberg New York 978-3-540-28467-3 Springer Berlin Heidelberg New York

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Preface

We welcome you to the 6th International Conference on E-Commerce and Web Technology (EC-Web 2005) held in Copenhagen, Denmark. It was held in conjunction with DEXA 2005. This conference was organized for the first time in Greenwich, UK, in 2000, and it has been able to attract an increasing number of participants and interest, reflecting the progress made in the field. As in the five previous years, EC-W