(Many) XML Schema Questions

Box, Don dbox at develop.com
Tue Dec 28 04:47:50 GMT 1999

> -----Original Message-----
> From: Tim Bray [mailto:tbray at textuality.com]
> Sent: Monday, December 27, 1999 8:01 PM
> To: xml-dev at ic.ac.uk
> Subject: Re: (Many) XML Schema Questions
> At 05:15 PM 12/27/99 -0500, Roger Costello wrote:
> >2. The namespace spec clearly indicates that there is
> >no guarantee that there is anything at the URL referenced
> >by a namespace.  However, with XML Schemas, it seems
> >that the namespace referenced in an XML instance document
> >must necessarily reference an XML Schema.  Is this a violation
> >of the namespace spec
> I haven't read a recent schema draft, but if it says what you 
> say it says,
> then in my opinion that would be an egregious design error.  

Agreed, since I have been using URNs almost exclusively as namespace URIs.
Fortunately, that's not what the schema spec states. Check out section 4.3.2
of the dec. 17 draft (http://www.w3.org/TR/xmlschema-1/#schema-loc) which
describes the 'xsi:schemaLocation' attribute. Also, see
html for James Clark's comments on this attribute.

> It is of course 
> not a violation of the namespace spec, 

Yes, but if schemas required xmlns to be a URL that refers to the schema
definition, the utility of XML schemas would be greatly diminished given the
current XMLNS recommendation.


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