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Wayne Steele wrote:

> Yes, I know how it works with DTDs. But users of documents processes 
> them using the DTD specified by (or even internal to) the instance.

You can have ambiguity and indirection even with DTDs (XML Catalogs can 
map public id to system id for example, and the actual DTD that gets 
processed might be different on different systems because of different 
DTD versions etc., especially if the public ID does not contain a 
version number), so the difference to schemas is not that great in this 
respect.

-- 
  Heikki Toivonen


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