Do you or Dont you buy Tim Bray's Namespace Validation Algorithm?

John Cowan cowan at
Thu Sep 10 22:51:17 BST 1998

Mark Tucker wrote:

>         DTD validation in the face of Namespaces:

On reflection, I don't --- quite.
>                 4. Do the same to the DTD's that you read in.

This is the sticky bit.  Tim Bray phrases it as "If necessary, rewrite
the DTD so that the same URIs have the same prefixes in DTD and

However, there is no formal way to express what prefixes in the DTD
refer to what namespace URIs.  In essence, you must know that in
advance.  For validation to be a mechanical process, you must have
some way of recording the frozen namespace-URI map for the DTD.

(Please don't mutter "PI".  That is what the old draft had, and a good
thing it was too, but the new draft abandoned it.)

John Cowan		cowan at
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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