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   RE: [xml-dev] Interesting mailing list & a rare broadside

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--On 09 June 2002 17:08 +0700 James Clark <jjc@jclark.com> wrote:

> Certainly there is a need to be able to associate a schema with a
> document. We discussed this during the development of RELAX NG, but we
> reached the conclusion that it was better not to include this
> functionality as part of the schema language.

Another reason I forgot to mention is that I think the relationship between 
instances and schemas is many-to-many. In particular, an instance can be 
simultaneously valid against multiple schemas.  Here I don't just mean 
there may be a separate schema for each namespace: the elements in a single 
namespace in a single document may be valid against multiple schemas. One 
common example is that you have a both a public schema which is relatively 
loose and a private schema which is much tighter.  In fact, you have can 
have a whole hierarchy of organizational levels (e.g. industry, company, 
project), with the schema becoming less general and more specialized as you 
move down the organizational tree.  An approach where you specify a single 
schema in the instance doesn't seem to me to deal with this scenario very 



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