To validate or not to validate, that is the question

Dan Brickley Daniel.Brickley at
Mon Aug 17 17:02:26 BST 1998

On Mon, 17 Aug 1998, John Cowan wrote:

> 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:

... has a number more and discusses broader motivations for tackling
this. In particular
should be of interest.


Daniel.Brickley at                           
Institute for Learning and Research Technology
University of Bristol,  Bristol BS8 1TN, UK.     tel: +44(0)117 9288478

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