Advances in Databases 19th British National Conference on Databases, BNCOD 19, Sheffield, UK, July 17-19, 2002. Proceedings - Eaglestone, Barry; Eaglestone, Barry; North, Siobhan; North, Siobhan; Poulovassilis, Alexandra; Poulovassilis, Alexandra (Springer Berlin Heidelberg : Imprint: Springer, 2002)