>Anyway, I'd like to assemble a list of HTML products that disobey SGML rules,
Who should be the arbiter of disputed claims? perhaps SGML Open?
It might be more constructive to keep a list of conforming systems.
(Certainly this would be a shorter list. :) The only product I know of that
claims conformance is SoftQuad's HoTMetaL (as stated in the "About..." screen).
Surely most (all?) HTML browsers are not "conforming SGML systems" in terms
of ISO 8879-1 since they choke on so many standard features of the language.
-kmc