Database and Expert Systems Applications 23rd International Conferen

This two volume set LNCS 7446 and LNCS 7447 constitutes the refereed proceedings of the 23rd International Conference on Database and Expert Systems Applications, DEXA 2012, held in Vienna, Austria, September 3-6, 2012. The 49 revised full papers presente

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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

7446

Stephen W. Liddle Klaus-Dieter Schewe A Min Tjoa Xiaofang Zhou (Eds.)

Database and Expert Systems Applications 23rd International Conference, DEXA 2012 Vienna, Austria, September 3-6, 2012 Proceedings, Part I

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Volume Editors Stephen W. Liddle Brigham Young University, Marriott School 784 TNRB, Provo, UT 84602, USA E-mail: [email protected] Klaus-Dieter Schewe Software Competence Center Hagenberg Softwarepark 21, 4232 Hagenberg, Austria E-mail: [email protected] A Min Tjoa Vienna University of Technology, Institute of Software Technology Favoritenstraße 9-11/188, 1040 Wien, Austria E-mail: [email protected] Xiaofang Zhou University of Queensland School of Information Technology and Electrical Engineering Brisbane, QLD 4072, Australia E-mail: [email protected]

ISSN 0302-9743 e-ISSN 1611-3349 e-ISBN 978-3-642-32600-4 ISBN 978-3-642-32599-1 DOI 10.1007/978-3-642-32600-4 Springer Heidelberg Dordrecht London New York Library of Congress Control Number: 2012943836 CR Subject Classification (1998): H.2.3-4, H.2.7-8, H.2, H.3.3-5, H.4.1, H.5.3, I.2.1, I.2.4, I.2.6, J.1, C.2 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 Scie