Hagen Höpfner Friederike Klan Post-Proceedings of the 19. GI-Workshop on Foundations of Databases (Grundlagen von Datenbanken), Bretten, Baden-Württemberg, Germany, May 29 - June 1, 2007 School of Information Technology, International University in Germany Technical Report 02/2007 Grundlagen von Datenbanken 2007 db/conf/gvd/gvd2007.html http://www.i-u.de/index.php?id=527