Another reason why namespaces URLs should not be schemas

Fri Jun 18 00:01:12 BST 1999

We have addressed this problem in XML Schema with the 
import/include distinction. Please take a look.

At 05:07 AM 6/18/99 +1000, Rick Jelliffe wrote:
>If I am using XHTML and I decide to refine my
>document type so that headers must be inside divisions,
>what do I do (if namespace URLs can be resolved to
>schemas)?
>
>Presumably, I have to derive a new schema based on
>the old one, with a new URL; then I have to use that new
>URL as the namespace URL. Then IE 5 and everything
>that works by using the namespace URL to signify the
>operation of an element will be broke.
>
>This seems to me to be unworkable:  if I make
>
><html  xmlns="http://rick.com.xx/my-html.xmlschema">
>...
></html>
>then a rendering engine has to download my corpulent (not to
>mention grumous) XML schema before it can find out that
>in fact my element types are HTML.
>
>So it seems that overloading the function of the namespace
>URI to also be a schema URL would have a bad effect on
>XHTML with data islands etc, or on any DTD derived from
>DTDs that are built into the processor.
>
>It seems that the situation we are reaching is that the 
>namespace prefix is being treated as unique for famous
>DTDs (e.g. how IE 5 treats html:) and that the
>URL is being used as a schema name. If people want
>to do this, that is fine, but it does not correspond to namespaces
>(in fact, it corresponds more to what I suggested in 
>XML-Bind  -- a simple prefixing system to make
>automated renaming more manageable and a way to
>bind names to schemas, except I suggested regular expression
>matching not just the prefix).
>
>Rick Jelliffe
>
>
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