WWW 2007 May 8-12, 2007. Banff, Alberta, Canada WWW2007 Organization and Committees Conference Committee General Chairs Carey Williamson, University of Calgary, Canada Mary Ellen Zurko, IBM, USA Technology for Developing Regions Chair: Krithi Ramamritham, IIT Bombay, India Deputy: Kentaro Toyama, Microsoft Research, India Web Engineering Chair: San Murugesan, Southern Cross University, Australia Deputy: Oscar Pastor Lopez, Polytechnic University of Valencia, Spain Program Chairs Peter Patel-Schneider, Bell Labs Research, USA Prashant Shenoy, University of Massachusetts at Amherst, USA Web Services Chair: Paul Watson, University of Newcastle upon Tyne, UK Deputy: Jim Webber, ThoughtWorks, Australia Track Chairs and Deputy Chairs Browsers and User Interfaces Chair: Rob Miller, Massachusetts Institute of Technology, USA Deputy: Xing Xie, Microsoft Research Asia, China XML and Web Data Chair: Mark Baker, Coactus, Canada Deputy: Juliana Freire, University of Utah, USA Data Mining Chair: Roberto Bayardo, Google, USA Deputy: Kyuseok Shim, Seoul National University, Korea Posters Chair: Xiaodong Zhang, Ohio State University, USA Deputy: Vova Soroka, IBM Haifa, Israel E*-Applications Chair: Wolfgang Nejdl, L3S and University of Hannover, Germany Deputy: Elisa Bertino, Purdue University, USA Tutorials and Workshops Chair: Marc Najork, Microsoft, USA Deputy: Aya Soffer, IBM Haifa, Israel Industrial Practice and Experience Chair: Mehran Sahami, Google, USA Deputy: Kobus van der Merwe, AT&T Labs ­ Research, USA Developers Track Chair: Danny Ayers Deputy: Mark Nottingham, Yahoo! Inc, USA W3C Track Chair: Marie-Claire Forgue, W3C, France Performance and Scalability Chair: Michele Colajanni, University of Modena, Italy Deputy: Martin Arlitt, HP Labs, USA and University of Calgary, Canada Professional Conference Organizer Unni Soelberg-Claridge, CMP, CMM, EventPlan, Calgary, Canada Aileen Boyle Lozie, B.Comms., EventPlan, Calgary, Canada Pervasive Web and Mobility Chair: Jason Nieh, Columbia University and VMware, USA Deputy: Robin Kravets, University of Illinois at Urbana-Champaign, USA Local Organizing Committee Denilson Barbosa, University of Calgary, Canada Carole Carlton, iCORE, Calgary, Canada Chris Gutteridge, University of Southampton, UK Lisa Higham, University of Calgary, Canada Gwen Houtzager, University of Calgary, Canada Michal Jacovi, IBM Haifa Research Lab, Israel Rohit Khare, USA Zongpeng Li, University of Calgary, Canada Anirban Mahanti, University of Calgary, Canada Megabite, Bow River, Banff, Canada John Miller, Southern Cross University, Australia Camille Sinanan, University of Calgary, Canada Sue Williamson, Calgary, Canada Nathan Wormsbecker, University of Calgary, Canada Search Chair: Andrei Broder, Yahoo! Research, USA Deputy: Ronny Lempel, IBM Haifa, Israel Security, Privacy, Reliability, and Ethics Chair: Angelos Keromytis, Columbia University, USA Deputy: Dan Wallach, Rice University, USA Semantic Web Chair: Rudi Studer, University of Karlsruhe and FZI, Germany Deputy: Riichiro Mizoguchi, Osaka University, Japan WWW 2007 May 8-12, 2007. Banff, Alberta, Canada Program Committee Program Chairs Peter Patel-Schneider, Bell Labs Research, USA Prashant Shenoy, University of Massachusetts at Amherst, USA Data Mining Chair: Roberto Bayardo, Google, USA Deputy: Kyuseok Shim, Seoul National University, Korea Charu Aggarwal, IBM T.J. Watson Research Center, USA Rakesh Agrawal, Microsoft Search Labs, USA Wray Buntine, Helsinki Institute of Information Technology, Finland Ming-Syan Chen, National Taiwan University, Taiwan Wei Fan, IBM T.J. Watson Research Center, USA Aristides Gionis, University of Helsinki, Finland Marko Grobelnik, J. Stefan Institute, Slovenia Jiawei Han, University of Illinois at Urbana-Champaign, USA Andreas Hotho, University of Kassel, Germany Masaru Kitsuregawa, University of Tokyo, Japan Dongwon Lee, Penn State University, USA Bing Liu, University of Illinois at Chicago, USA Mark Manasse, Microsoft Research, USA Dunja Mladenic, J. Stefan Institute, Slovenia Beng Chin Ooi, National University of Singapore, Singapore Jung Soo Park, Sungshin University, Korea Jian Pei, Simon Fraser University, Canada Sridhar Rajagopalan, IBM Almaden, USA Raghu Ramakrishnan, University of Wisconsin/Yahoo!, USA Rajeev Rastogi, Bell Laboratories, USA Deepak Ravichandran, Google, USA Barry Smyth, University College Dublin, Ireland Myra Spiliopoulou, Universitat Magdeburg, Germany Ramakrishnan Srikant, Google, USA Andrew Tomkins, Yahoo!, USA Ji-Rong Wen, Microsoft Research Asia, China Jeffrey Xu Yu, The Chinese University of Hong Kong, Hong Kong Browsers and User Interfaces Chair: Rob Miller, Massachusetts Institute of Technology, USA Deputy: Xing Xie, Microsoft Research Asia, China Chieko Asakawa, IBM, Japan Shumeet Baluja, Google, USA Patrick Baudisch, Microsoft Research, USA Peter Brusilovsky, University of Pittsburgh, USA Ed Chi, PARC, USA Susan Dumais, Microsoft Research, USA Vicki Hanson, IBM Research, USA Simon Harper, University of Manchester, UK Masahiro Hori, Kansai University, Japan Chris Johnson, Glasgow University, UK Matt Jones, Swansea University, UK Yutaka Kidawara, NICT, Japan Tessa Lau, IBM Almaden, USA Paul P. Maglio, IBM Almaden, USA Helen Petrie, University of York, UK WWW 2007 May 8-12, 2007. Banff, Alberta, Canada E* Applications Chair: Wolfgang Nejdl, L3S and University of Hannover, Germany Deputy: Elisa Bertino, Purdue University, USA Juergen Angele, Ontoprise, Germany Wolf-Tilo Balke, L3S and University of Hannover, Germany Jim Basney, NCSA, USA Kalina Bontcheva, University of Sheffield, UK Athman Bouguettaya, Virginia Tech, USA Peter Brusilovsky, University of Pittsburgh, USA Malu Castellanos, HP Research Labs, USA Stefano Ceri, Politecnico di Milano, Italy Boris Chidlovskii, Xerox Research Centre Europe, France Alexandra Cristea, University of Warwick, UK John Domingue, Knowledge Media Institute, UK Thomas Fahringer, University of Innsbruck, Austria Jianping Fan, University of North-Carolina at Charlotte, UK Christoph Freytag, Humboldt University, Berlin, Germany Moustafa Ghanem, Imperial College, London, UK C. Lee Giles, Pennsylvania State University, USA Jeffrey Grethe, University of California, San Diego, USA Friedrich Hesse, University of Tubingen, Germany Geert-Jan Houben, VU Brussel, Belgium Matthias Jarke, RWTH Aachen, Germany Rohit Khare, CommerceNet, USA Rob Koper, Open University, Netherlands Massimo Mecella, University of Rome La Sapienza, Italy Erica Melis, DFKI, Germany Daniel Schwabe, PUC Rio de Janeiro, Brazil Amit Sheth, University of Georgia and Semagix, USA Heinz Stockinger, University of Vienna, Austria Kien-Lee Tan, National University of Singapore, Singapore Klaus Tochtermann, TU Graz, Austria Xiaoxin Wu, Intel, China Aoying Zhou, Fudan University, China Industrial Practice and Experience Chair: Mehran Sahami, Google, USA Deputy: Kobus van der Merwe, AT&T Labs ­ Research, USA Nikos Anerousis, IBM Research, USA Eric Brill, Microsoft Research, USA Mayur Datar, Google, USA Ashutosh Garg, Google, USA Rayid Ghani, Accenture Labs, USA Eric Horvitz, Microsoft Research, USA Ravi Kumar, Yahoo! Research, USA Yunhao Liu, Hong Kong University of Science and Technology, China Omid Madani, Yahoo! Research, USA Z. Morley Mao, University of Michigan, USA Vibhu Mittal, Google, USA Andrew W. Moore, Queen Mary, University of London, UK Richard Mortier, Microsoft Research, Cambridge, UK Jan Pedersen, Yahoo!, USA Dan Pei, AT&T Labs ­ Research, USA Yin Zhang, University of Texas at Austin, USA WWW 2007 May 8-12, 2007. Banff, Alberta, Canada Performance and Scalability Chair: Michele Colajanni, University of Modena, Italy Deputy: Martin Arlitt, HP Labs, USA and University of Calgary, Canada Virgilio Almeida, Federal University of Minas Gerais, Brazil Azer Bestavros, Boston University, USA Ernst Biersack, Institut Eurecom, France Valeria Cardellini, University of Rome "Tor Vergata", Italy Abhishek Chandra, University of Minnesota, USA Ming-Syan Chen, National Taiwan University, Taiwan Mike Dahlin, University of Texas at Austin, USA Jeff Dean, Google, USA Anja Feldmann, Deutsche Telekom Laboratory and Technical University Berlin, Germany Steve Gribble, University of Washington, USA Arun Iyengar, IBM Research, USA Sue Moon, KAIST, Korea Vivek Pai, Princeton University, USA Michael Rabinovich, Case Western Reserve University, USA Bianca Schroeder, Carnegie Mellon University, USA Xueyan Tang, Nanyang Technological University, Singapore Maarten Van Steen, Vrie University, The Netherlands Arun Venkataramani, University of Massachusetts at Amherst, USA Craig Wills, Worcester Polytechnic Institute, USA Pervasive Web and Mobility Chair: Jason Nieh, Columbia University and VMware, USA Deputy: Robin Kravets, University of Illinois at Urbana-Champaign, USA Nina Bhatti, HP Labs, USA Nigel Davies, Lancaster University, UK Maria Ebling, IBM Research, USA Gail Kaiser, Columbia University, USA Reiner Ludwig, Ericsson Research, Germany Amy Murphy, ITC-IRST, Italy Chandra Narayanaswami, IBM Research, USA Bhaskaran Raman, IIT Kanpur, India Pablo Rodriguez, Microsoft Research, UK Bill Schilit, Intel Research, USA WWW 2007 May 8-12, 2007. Banff, Alberta, Canada Search Chair: Andrei Broder, Yahoo! Research, USA Deputy: Ronny Lempel, IBM Haifa, Israel Serge Abiteboul, INRIA, France Lada Adamic, University of Michigan, USA Judit Bar-Ilan, Bar Ilan University, Israel Ziv Bar-Yossef, Technion, Israel Andras A. Benczur, Hungarian Academy of Sciences, Hungary Paolo Boldi, University of Milano, Italy Eric Brown, IBM T.J. Watson Research Center, USA Soumen Chakrabarti, IIT Bombay, India Junghoo Cho, UCLA, USA Abdur Chowdhury, AOL Research, USA Nick Craswell, Microsoft Research, Cambridge, UK Brian Davison, Lehigh University, USA Nadav Eiron, Google, USA Marcus Fontoura, Yahoo!, USA Juliana Freire, University of Utah, USA C. Lee Giles, Penn State University, USA Eric Glover, Ask, USA Antonio Gulli, Ask, USA David Hawking, CSIRO, Australia Monika Henzinger, Google, USA Jeanette Janssen, Dalhousie University, Canada Glen Jeh, Google, USA Vanja Josifovski, Yahoo!, USA Kevin Lang, Yahoo!, USA Hang Li, Microsoft Research Asia, China Ling Liu, Georgia Tech, USA Wei-Ying Ma, Microsoft Research Asia, China Yoelle Maarek, Google, Israel Kevin McCurley, Google, USA Frank McSherry, Microsoft, USA Massimo Melucci, University of Padova, Italy Alistair Moffat, University of Melbourne, Australia Gonzalo Navarro, University of Chile, Chile Christopher Olston, Yahoo!, USA Iadh Ounis, University of Glasgow, UK Davood Rafiei, University of Alberta, Canada Sriram Raghavan, IBM, USA Sridhar Rajagopalan, IBM, USA Edleno Silva de Moura, Universidade Federal do Amazonas, Brazil Fabrizio Silvestri, ISTI-CNR, Pisa, Italy D. Sivakumar, Google, USA Altigran Soares da Silva, University of Amazonas, Brazil Torsten Suel, Polytechnic University, USA Panayiotis Tsaparas, Microsoft, USA Sebastiano Vigna, University of Milano, Italy Gerhard Weikum, Max-Planck-Institut fur Informatik, Germany Hugo Zaragoza, Yahoo! Research, Barcelona, Spain Justin Zobel, RMIT, Australia Security, Privacy, Reliability, and Ethics Chair: Angelos Keromytis, Columbia University, USA Deputy: Dan Wallach, Rice University, USA Scott Alexander, Telcordia, USA Weidong Cui, Microsoft Research, USA George Danezis, KU Leuven, Belgium Roberto Di Pietro, University of Roma "La Sapienza", Italy Nick Feamster, Georgia Tech, USA Bao Feng, Institute for Infocomm Research, Singapore Kevin Fu, University of Massachusetts at Amherst, USA John L. Griffin, BAE Stuart Haber, HP Labs, USA Goichiro Hanaoka, JAIST, Japan Markus Jakobsson, University of Indiana, USA Sam King, University of Illinois at Urbana-Champaign, USA Yoshi Kohno, University of Washington, USA Shriram Krishnamurthy, Brown University, USA Christopher Kruegel, Technical University Vienna, Austria Ninghui Li, Purdue University, USA Patrick McDaniel, Penn State University, USA Raphael C.-W. Phan, Swinburne University of Technology, Malaysia Vassilis Prevelakis, Drexel University, USA Eric Rescorla, RTFM Inc., USA Jim Roskind, Roskind Consulting, USA Ke Wang, Google, USA Brent Waters, SRI, USA Nick Weaver, ICSI, USA Susanne Wetzel, Stevens Institute of Technology, USA Matt Wright, University of Texas at Arlington, USA WWW 2007 May 8-12, 2007. Banff, Alberta, Canada Semantic Web Chair: Rudi Studer, University of Karlsruhe and FZI, Germany Deputy: Riichiro Mizoguchi, Osaka University, Japan Dean Allemang, Top Quadrant, USA Sean Bechhofer, University of Manchester, UK Harold Boley, University of New Brunswick, Canada Francois Bry, University of Munich, Germany Paul Buitelaar, DFKI, Germany Key-Sun Choi, KAIST, Korea Nigel Collier, National Institute of Informatics, Japan Hamish Cunningham, University of Sheffield, UK John Davies, British Telecom, UK Grit Denker, SRI International, USA Li Ding, Stanford University, USA Thomas Eiter, Vienna University of Technology, Austria Dieter Fensel, DERI, University of Innsbruck, Austria Tim Finin, University of Maryland, Baltimore County, USA Jennifer Golbeck, University of Maryland, USA Christine Golbreich, Universite de Rennes 1, France Asuncion Gomez-Perez, UPM, Spain Sung-Kook Han, Won Kwang University, Korea Lynda Hardman, CWI, The Netherlands Manfred Hauswirth, DERI Galway, Ireland Jeff Heflin, Lehigh University, USA Kaoru Hiramatsu, NTT Communication Science Labs, Japan Pascal Hitzler, University of Karlsruhe, Germany Masahiro Hori, Kansai University, Japan Eduard Hovy, UCS/ISI, USA Vipul Kashyap, Partners HealthCare System, Inc., USA Atanas Kiryakov, Ontotext Lab, Sirma Group, Bulgaria Michel Klein, Vrije Universiteit Amsterdam, The Netherlands Alain Leger, France Telecom, France Luke McDowell, US Naval Academy, USA Gregoris Mentzas, NTUA, Greece Dunja Mladenic, J. Stefan Institute, Slovenia Enrico Motta, Open University, UK Mark Musen, Stanford University, USA John Mylopoulos, University of Toronto, Canada Claire Nedellec, MIG-INRA, France Massimo Paolucci, NTT, Germany Dimitris Plexousakis, University of Crete, Greece Amit Sheth, University of Georgia, USA Umberto Straccia, ISTI-CNR, Italy Gerd Stumme, University of Kassel, Germany Hideaki Takeda, National Institute of Informatics, Japan Takahira Yamaguchi, Keio University, Japan Technology for Developing Regions Chair: Krithi Ramamritham, IIT Bombay, India Deputy: Kentaro Toyama, Microsoft Research, India Richard Anderson, University of Washington, USA Anupam Basu, Indian Institute of Technology, Kharagpur, India Michael Best, Georgia Tech, USA Eric Brewer, University of California at Berkeley, USA U.B. Desai, Indian Institute of Technology, Bombay, India S. Keshav, University of Waterloo, Canada Margaret Martonosi, Princeton University, USA Wagner Meira Jr., Universidade Federal de Minas Gerais, Brazil Tapan Parikh, University of Washington, USA Jacques Steyn, Monash University, South Africa Eswaran Subrahmanian, Carnegie Mellon University, USA WWW 2007 May 8-12, 2007. Banff, Alberta, Canada Web Engineering Chair: San Murugesan, Southern Cross University, Australia Deputy: Oscar Pastor Lopez, Polytechnic University of Valencia, Spain Virgilio Almedia, Federal University of Minas Gerais, Brazil Luciano Baresi, Politecnico di Milano, Italy Rafael Calvo, University of Sydney, Australia Paul Dantzig, IBM T.J. Watson Research Center, USA Olga De Troyer, Vrije Universiteit Brussel, Belgium Yogesh Deshpande, University of Western Sydney, Australia Oscar Diaz, University of the Basque Country, Spain Piero Fraternali, Fraternali, Politecnico di Milano, Italy Martin Gaedke, University of Karlsruhe, Germany Aditya Ghose, University of Wollongong, Australia Athula Ginige, University of Western Sydney, Australia Angela Goh, Nanyang Technological University, Singapore Jaime Gomez, Universidad de Alicante, Spain Geert-Jan Houben, Eindhoven University of Technology, The Netherlands Stanislaw Jarzabek, National University of Singapore, Singapore Gerti Kappel, Vienna University of Technology, Austria Nora Koch, Ludwig-Maximilians-Universitat Munchen, Germany David Lowe, Icar-CNR, Italy Wei-Ying Ma, Microsoft Research Asia, China Heinrich Mayr, University of Klagenfurt, Austria Emilia Mendes, University of Auckland, New Zealand Luis Olsina, Universidad Nacional de La Pampa, Argentina Vicente Pelechano, Universidad Politecnica de Valencia, Spain Werner Retschitzegger, University of Linz, Austria Gustavo Rossi, Universidad Nacional de la Plata, Argentina Arthur Ryman, IBM Toronto Lab, Canada Klaus-Dieter Schewe, Massey University, New Zealand Daniel Schwabe, PUC Rio de Janeiro, Brazil Wieland Schwinger, Johannes Kepler University Linz, Austria Woojong Suh, Inha University, Korea Katsumi Tanaka, Kyoto University, Japan Fabio Vitali, University of Bologna, Italy Bebo White, Stanford Linear Accelerator Center, USA Web Services Chair: Paul Watson, University of Newcastle upon Tyne, UK Deputy: Jim Webber, ThoughtWorks, Australia Boualem Benatallah, University of New South Wales, Australia Sanjay Chaudhary, DA-IICT, India Thomas Erl, SOA Systems, Canada Alan Fekete, University of Sydney, Australia Jinpeng Huai, Beihang University, China Hiro Kishimoto, Fujitsu, Japan Frank Leymann, University of Stuttgart, Germany Mark Little, Jboss, UK Jimmy Nilson, JNSK, Sweden Dare Obasanjo, Microsoft, USA Savas Parastatidis, Microsoft, USA Greg Pavlik, Oracle Corporation, USA Denis Sosnoski, Sosnoski Software Solutions, New Zealand Tony Storey, IBM, UK Japjit Tulsi, Google, USA William Vambenepe, Hewlett-Packard, USA Steve Vinoski, IONA Technologies, USA Stuart Wheater, Arjuna Technologies, UK Michal Zaremba, Digital Enterprise Research Institute, Ireland WWW 2007 May 8-12, 2007. Banff, Alberta, Canada XML and Web Data Chair: Mark Baker, Coactus, Canada Deputy: Juliana Freire, University of Utah, USA Sihem Amer-Yahia, Yahoo! Research, USA Denilson Barbosa, University of Calgary, Canada Michael Benedikt, Bell Labs, Lucent, USA Angela Bonifati, Icar-CNR, Italy John Boyer, IBM, USA Michael Champion, Microsoft, USA Chee Yong Chan, National University of Singapore, Singapore Micah Dubinko, Yahoo!, USA Wenfei Fan, University of Edinburgh, Scotland Carlos Heuser, UFRGS, Brazil Ken Holman, Crane Softwrights Christoph Koch, Saarbruken, Germany Guido Moerkotte, University of Mannheim, Germany Fatma Ozcan, IBM Almaden, USA Tamer Ozsu, University of Waterloo, Canada Raghu Ramakrishnan, Yahoo! Research, USA Maya Ramanath, Max-Planck-Institut, Germany Rich Salz, IBM, USA Sunita Sarawagi, IIT Bombay, India Altigran Silva, UFAM, Brazil Tutorials and Workshops Chair: Marc Najork, Microsoft, USA Deputy: Aya Soffer, IBM Haifa, Israel Daniel Appelquist, Vodaphone, UK Ricardo Baeza-Yates, Yahoo!, Spain David Carmel, IBM, Israel Fred Douglis, IBM, USA Piero Fraternali, University of Milan, Italy Martin Gaedke, University of Karlsruhe, Germany Carole Goble, University of Manchester, UK Ian Horrocks, University of Manchester, UK Bing Liu, University of Illinois at Chicago, USA Wei-Ying Ma, Microsoft, China Lloyd Rutledge, CWI, Netherlands Massimo Santini, University of Milan, Italy Steffen Staab, University of Koblenz, Germany Dan Suciu, University of Washington, USA Terry Winograd, Stanford University, USA Developers Track Chair: Danny Ayers Deputy: Mark Nottingham, Yahoo! Inc, USA Mark Baker Ian Bicking Chris Bizer Dan Brickley Elliot Rusty Harold Bill de Hora Yves Lafon Thomas Roessler James Tauber Posters Chair: Xiaodong Zhang, Ohio State University, USA Deputy: Vova Soroka, IBM Haifa, Israel Karine Barzilai-Nahon, University of Washington, USA Brian Davison, Lehigh University, USA Ido Guy, Technion, Israel Institute of Technology, Israel Michal Jacovi, IBM Haifa Research Lab, Israel Xuxian Jiang, George Mason University, USA Quentin Jones, New Jersey Institute of Technology, USA Chung-Ta King, National Tsinghua University, Taiwan Santosh Kumar, University of Memphis, USA Alex Liu, Michigan State University, USA Dong Lu, Ask.com, USA Natalia Marmasse, Google, USA Gilad Ravid, University of Southern California, USA Eyal Sonsino, IBM Research, Israel Hongwei Zhang, Wayne State University, USA