> Martin Bryan wrote:
>
> > Why does this group seem to feel there is an overpowering need to develop a
> > DTD that can be used to validate the compound structure, rather than its
> > individual fragments?
>
> I think your model of "compound document" is too simple. You seem
> to model it as a set of self-contained fragments enclosed in a
> container.
>
> I expect to see much more complex documents: a Chemical ML description
> of a molecule, with (a) embedded HTML English-language documentation,
> which itself contains several inclusions of MathML, and (b) a SMIL
> document that marshals a non-XML movie of the molecule. How would
> you validate just the HTML part, given that the HTML DTD does not
> understand MathML?
Nice real-life example. The paper 'Web Architecture: Extensible
Languages', by Tim Berners-Lee & Dan Connolly, URL:
http://www.w3.org/TR/NOTE-webarch-extlang
... has a number more and discusses broader motivations for tackling
this. In particular http://www.w3.org/TR/NOTE-webarch-extlang#Mixing
should be of interest.
Dan
-- Daniel.Brickley@bristol.ac.uk Institute for Learning and Research Technology http://www.ilrt.bris.ac.uk/ University of Bristol, Bristol BS8 1TN, UK. tel: +44(0)117 9288478