My understanding was that SGML content models have to be deterministic to
start with in order to avoid problems with automatic reduction to DFAs
because of and groups, etc.
My automata theory is a bit rusty but check out Annex H of ISO 8879.
James
-- James Tauber / jtauber@jtauber.com http://www.jtauber.com/ Lecturer and Associate Researcher Electronic Commerce Network ( http://www.xmlinfo.com/ Curtin Business School ( http://www.xmlsoftware.com/ Perth, Western Australia ( http://www.schema.net/