Logic, Language, Information and Computation 14th International Work

Welcome to the proceedings of the 14th WoLLIC meeting, which was held in Rio de Janeiro, Brazil, July 2 - 5, 2007. The Workshop on Logic, Language, Information and Computation (WoLLIC) is an annual international forum on inter-disciplinary research involv

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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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Daniel Leivant Ruy de Queiroz (Eds.)

Logic, Language, Information and Computation 14th International Workshop, WoLLIC 2007 Rio de Janeiro, Brazil, July 2-5, 2007 Proceedings

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Volume Editors Daniel Leivant Indiana University Computer Science Department Bloomington, IN 47405, USA E-mail: [email protected] Ruy de Queiroz Universidade Federal de Pernambuco Centro de Informatica Av Prof. Luis Freire, s/n Cidade Universitaria, 50740-540 Recife, PE, Brasil E-mail: [email protected]

Library of Congress Control Number: 2007929582 CR Subject Classification (1998): F.1, F.2.1-2, F.4.1, G.1.0, I.2.6 LNCS Sublibrary: SL 1 – Theoretical Computer Science and General Issues ISSN ISBN-10 ISBN-13

0302-9743 3-540-73443-0 Springer Berlin Heidelberg New York 978-3-540-73443-7 Springer Berlin Heidelberg New York

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Preface

Welcome to the proceedings of the 14th WoLLIC meeting, which was held in Rio de Janeiro, Brazil, July 2 - 5, 2007. The Workshop on Logic, Language, Information and Computation (WoLLIC) is an annual international forum on inter-disciplinary research involving formal logic, computing and programming theory, and natural language and reasoning. The WoLLIC meetings alternate between Brazil (and Latin America) and other countries, with the aim of fostering interest in applied logic among Latin American scientists and students, and