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* Copyright and Authorship Notice
This chapter has been written by Jon Duckett and is taken from "Professional XML Schemas" by Jon Duckett, Oliver Griffin, Stephen Mohr, Francis Norton, Ian Stokes-Rees, Kevin Williams, Kurt Cagle, Nikola Ozu and Jeni Tennison published by Wrox Press Limited in July 2001; ISBN 1861005474; copyright © Wrox Press Limited 2001; all rights reserved.

No part of this chapter may be reproduced, stored in a retrieval system or transmitted in any form or by any means -- electronic, electrostatic, mechanical, photocopying, recording or otherwise -- without the prior written permission of the publisher, except in the case of brief quotations embodied in critical articles or reviews.