Database and XML Technologies Second International XML Database Symposium, XSym 2004, Toronto, Canada, August 29-30, 2004, Proceedings - Bellahsène, Zohra; Bellahsène, Zohra; Milo, Tova; Milo, Tova; Rys, Michael; Rys, Michael; Suciu, Dan; Suciu, Dan; Unland, Rainer; Unland, Rainer (Springer Berlin Heidelberg : Imprint: Springer, 2004)