Multiparadigm Programming in Mozart/Oz Second International Conferen

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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 New York University, NY, 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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Peter Van Roy (Ed.)

Multiparadigm Programming in Mozart/Oz Second International Conference, MOZ 2004 Charleroi, Belgium, October 7-8, 2004 Revised Selected and Invited Papers

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Volume Editor Peter Van Roy Université catholique de Louvain Department of Computing Science and Engineering Place Sainte Barbe, 2, B-1348 Louvain-la-Neuve, Belgium E-mail: [email protected]

Library of Congress Control Number: 2005921638 CR Subject Classification (1998): D.3, F.3, D.2, D.1, D.4 ISSN 0302-9743 ISBN 3-540-25079-4 Springer Berlin Heidelberg New York 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. Springer is a part of Springer Science+Business Media springeronline.com © Springer-Verlag Berlin Heidelberg 2005 Printed in Germany Typesetting: Camera-ready by author, data conversion by Scientific Publishing Services, Chennai, India Printed on acid-free paper SPIN: 11398158 06/3142 543210

Foreword

To many readers, Mozart/Oz represents a new addition to the pantheon of programming systems. One way of evaluating a newcomer is through the eyes of the classics, for example Kernighan and Pike’s “The Practice of Programming,” a book that concludes with six “lasting concepts”: simplicity and clarity, generality, evolution, interfaces, automation, and notation. Kernighan and Pike concentrate on using standard languages such as C and Java to implement these concepts, but it is instructive to see how a multiparadigm language such as Oz changes the outlook. Oz’s concurrency model yields simplicity and clarity (because Oz makes it easier to express complex programs with many interacting components), generality, and better interfaces (because the dataflow model automatically makes interfaces more light