David Carlisle wrote --

... mostly about normalisation and concrete syntax.

He did not mention the lack of extensibility: was this deliberate?

It is tortuously difficult in SGML to have bothe extendabilty and
portability; it is therefore impossible to have extendability in XML
(correct?).

I know that it is not, in general, a Good Thing to have extendability
but ... see other message.


chris