E-Commerce and Web Technologies 7th International Conference, EC-Web

We welcome you to the 7th International Conference on E-commerce and Web Technologies (EC-Web 2006) held in Krakow, Poland, in conjunction with DEXA 2006. This conference was organized for the first time in Greenwich, UK, in 2000, and it has been able to

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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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Kurt Bauknecht Birgit Pröll Hannes Werthner (Eds.)

E-Commerce and Web Technologies 7th International Conference, EC-Web 2006 Krakow, Poland, September 5-7, 2006 Proceedings

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Volume Editors Kurt Bauknecht University of Zurich, Department of Informatics (IFI) Winterthurer Strasse 190, 8057 Zurich, Switzerland E-mail: baukn@ifi.unizh.ch Birgit Pröll Johannes Kepler University Linz, Institute for Applied Knowledge Processing (FAW) Softwarepark Hagenberg, 4232 Hagenberg, Austria E-mail: [email protected] Hannes Werthner Vienna University of Technology Institute of Software Technology and Interactive Systems, EC-Group Favoritenstr. 9-11, 1040 Vienna, Austria E-mail: [email protected]

Library of Congress Control Number: 2006931012 CR Subject Classification (1998): H.4, K.4.4, J.1, K.5, H.3, H.2, K.6.5 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI ISSN ISBN-10 ISBN-13

0302-9743 3-540-37743-3 Springer Berlin Heidelberg New York 978-3-540-37743-6 Springer Berlin Heidelberg New York

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Preface

We welcome you to the 7th International Conference on E-commerce and Web Technologies (EC-Web 2006) held in Krakow, Poland, in conjunction with DEXA 2006. This conference was organized for the first time in Greenwich, UK, in 2000, and it has been able to attract an increasing number o