Zohra Bellahsene Tova Milo Michael Rys Dan Suciu Rainer Unland Database and XML Technologies, Second International XML Database Symposium, XSym 2004, Toronto, Canada, August 29-30, 2004, Proceedings XSym Lecture Notes in Computer Science 3186 Springer 2004 3-540-22969-8 db/conf/xsym/xsym2004.html