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

Mark Tucker mct at
Thu Sep 10 23:09:04 BST 1998

John Cowan cowan at wrote:

mct>                 4. Do the same to the DTD's that you read in.

jc>This is the sticky bit.  Tim Bray phrases it as "If necessary, rewrite
jc>the DTD so that the same URIs have the same prefixes in DTD and
jc>However, there is no formal way to express what prefixes in the DTD
jc>refer to what namespace URIs.  In essence, you must know that in

Hmm, isn't there some place at the top of the Document defining
the DTD to write
and in so doing define the meaning of the prefixes this DTD uses?

jc> For validation to be a mechanical process, you must have
jc>some way of recording the frozen namespace-URI map for the DTD.

The namespace_prefix<->URI map for the DTD would be embedded in the DTD

The per-validation normalized_prefix<->namespace mapping
is maintained by the document validator process, and only needs
to live for the validation of a single document.

If you mean the mapping that tells validator processes that
	'The DTD known by "uri:FrenchLibrary"  is the following ....'
then that looks like a resource management issue that can be handled
by a higher level.

Mark Tucker			tucker_m at
Regenstrief Institute		phone: (317) 630-2606
1001 W. 10'th St; Indianapolis, IN; 46202-2859;	fax: (317) 630-6962

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