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