Mourad Ouzzani Qatar Computing Research Institute Qatar Foundation Doha, Qatar mouzzani@ Athman Bouguettaya School of Computer Science and Information Technology RMIT University Melbourne Victoria Australia Library of Congress Control Number: 2011939473 c Springer Science+Business Media, LLC 2011 All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer Science+Business Media, LLC, 233 Spring Street, New York, NY 10013, USA), except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar.
