Advances in Database Technology - EDBT 2004 9th International Conference on Extending Database Technology, Heraklion, Crete, Greece, March 14-18, 2004 - Bertino, Elisa; Christodoulakis, Stavros; Plexousakis, Dimitris; Christophides, Vassilis; Koubarakis, Manolis; Böhm, Klemens; Ferrari, Elena (Springer Berlin Heidelberg, 2004)