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   Re: XSchema Question 3: Internal/External subsets

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  • From: "Simon St.Laurent" <SimonStL@classic.msn.com>
  • To: "Xml-Dev (E-mail)" <xml-dev@ic.ac.uk>
  • Date: Sat, 30 May 98 21:00:41 UT

Peter Murray-Rust wrote:
>There are several concerns.
>     - should we allow DTD subsets and XSchemas to be mixed in a         >    
    document instance (whether delivered externally or internally)
>     - should we allow internal XSchemas (if so, should we use RDF 
>        notation)
>     - should we allow external XSchemas (I assume yes). If so, should 
>        they use RDF?
>     - should we allow internal and external XSchemas to be mixed.

I think the place to start with this - separate from the RDF and DTD 
discussions - is 

Should we allow internal XSchemas?

External XSchemas in some form I think are pretty much mandatory.  If we 
decide that we need internal XSchemas, then we need to decide how to demarcate 
them as schemas _and_ how they interact with external XSchemas.

At this point, I'd say no to internal XSchemas, if only because sorting out 
those details will take a long time and considerable debate.  It would also 
require us to find some way of hiding the internal XSchemas from non-XSchema 
aware processors, something I'm not fond of.

I'll reply to the first issue, mixing DTD subsets and XSchemas, in a separate 
reply regarding Question 4.

Simon St.Laurent
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