"Elisa Bertino""" is a well known expert in the integration of AI and database techniques, areas of O-O, distributed, deductive and multimedia databases and database security. She has chaired and given tutorials at many international conferences and published hundreds of journal papers and a book. Elisa is currently a professor of computer science at the University of Milan. "Barbara Catania""" is an assistant professor of computer science at the University of Genova, specializing in deductive and multimedia databases, and indexing techniques in object-oriented and constraint databases. She ha