Advances in Databases: Concepts, Systems and Applications 12th Inter

The 12th International Conference on Database Systems for Advanced Applications (DASFAA), organized jointly by the Asian Institute of Technology, National Electronics and Computer Technology Center and Sirindhorn International Institute of Technology, sou

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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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Ramamohanarao Kotagiri P. Radha Krishna Mukesh Mohania Ekawit Nantajeewarawat (Eds.)

Advances in Databases: Concepts, Systems and Applications 12th International Conference on Database Systems for Advanced Applications, DASFAA 2007 Bangkok, Thailand, April 9-12, 2007 Proceedings

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Volume Editors Ramamohanarao Kotagiri The University of Melbourne Department of Computer Science and Software Engineering Victoria 3010, Australia E-mail: [email protected] P. Radha Krishna Institute for Development and Research in Banking Technology Masab Tank, Hyderabad 500 057, Andhra Pradesh, India E-mail: [email protected] Mukesh Mohania IBM India Research Laboratory Institutional Area, Vasant Kunj, New Delhi 110 070, India E-mail: [email protected] Ekawit Nantajeewarawat Thammasat University - Rangsit Campus Sirindhorn International Institute of Technology Pathum Thani 12121, Thailand´ E-mail: [email protected]

Library of Congress Control Number: 2007923774 CR Subject Classification (1998): H.2, H.3, H.4, H.5, J.1 LNCS Sublibrary: SL 3 – Information Systems and Application, incl. Internet/Web and HCI ISSN ISBN-10 ISBN-13

0302-9743 3-540-71702-1 Springer Berlin Heidelberg New York 978-3-540-71702-7 Springer Berlin Heidelberg New York

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Preface

The 12th International Conference on Database Systems for Advanced Applications (DA