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Tim Bray writes:
> Charles Goldfarb (lead designer of SGML) actually suggested that we do
> this in XML, simply forbid mixed content.
I'd be pretty suspicious of Charles on this point -- it would have
ensured that people kept using SGML for large documentation systems
and limited XML to Web stuff.
I do believe that it would be useful to have a middle-level data layer
(say, "XDL") on top of XML. That layer could enforce both
restrictions (no mixed content) and more abstract, data-specific
conventions (such as typing, if it were actually a good idea). Other
data oriented specs could be built on top of it.
All the best,
David Megginson, email@example.com, http://www.megginson.com/