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Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the ACM copyright notice and the title of the publication and its date appear, and notice is given that copying is by permission of the ACM. To copy otherwise, or to republish, to post on servers or to redistribute to lists, requires a fee and/or special permissions from the publisher, ACM. EDBT/ICDT 2011, Uppsala, Sweden. Copyright 2011 ACM.

EDBT 2011 ISBN 978-1-4503-0528-0
ICDT 2011 ISBN 978-1-4503-0529-7

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About these Proceedings

This material has been collected and arranged by Julia Stoyanovich at the University of Pennsylvania, USA. We thank Jens Teubner at ETH Zürich, Switzerland for his invaluable help.