M. Bernauer, G. Kappel, G. Kramler:
"Approaches to Implementing Active Semantics with XML Schema";
in: "Proceedings of the 14th International Workshop on Database and Expert Systems Applications", IEEE Computer Society Press, 2003, ISBN: 0-7695-1993-8, S. 559 - 565.
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04404589