Lecture Notes in Computer Science 11434 Commenced Publication in 1973 Founding and Former Series Editors: Gerhard Goos, Juris Hartmanis, and Jan van Leeuwen Editorial Board Members David Hutchison, UK Takeo Kanade, USA Josef Kittler, UK Jon M. Kleinberg, USA Friedemann Mattern, Switzerland John C. Mitchell, USA Moni Naor, Israel C. Pandu Rangan, India Bernhard Steffen, Germany Demetri Terzopoulos, USA Doug Tygar, USA Services Science Subline of Lectures Notes in Computer Science Subline Editors-in-Chief Athman Bouguettaya, RMIT University, Melbourne, Australia Michael P. Papazoglou, University of Tilburg, The Netherlands Subline Editorial Board Boualem Bentallah, Australia Paul Maglio, USA Murthy Devarakonda, USA Klaus Pohl, Germany Carlo Ghezzi, Italy Stefan Tai, Germany Chi-Hung Chi, Tasmania Yuzuru Tanaka, Japan Hani Jamjoom, USA Christopher Ward, USA Ingolf Krueger, USA