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   Re: XSchema Spec - Content Model Declarations (Section 2.3), Draft 4

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  • From: rbourret@dvs1.informatik.tu-darmstadt.de (Ron Bourret)
  • To: xml-dev@ic.ac.uk
  • Date: Tue, 14 Jul 1998 10:10:36 +0200

John Cowan wrote:

> > 2) As John suggests, expand the legal elements beneath an XSchema element.  
> >  particular, add AttDef, Choice, Sequence, Mixed, and Ref to the XSchema
> > element.  (NotationType and EnumerationType no longer exist.  I have added 
> > to John's list.)
> My only criticism: I don't think Ref belongs here, simply because Refs
> don't have any content themselves: they are just pointers, so it seems
> useless, over-complicated, and confusing in XSchema to have pointers
> to pointers.

But Ref is a valid content model:

<ElementDecl Name="Section">
   <Ref Element="Paragraph" Frequency="OneOrMore"/>

(i.e. <!ELEMENT Section (Paragraph+)>  )

If I want to be able to store more complex content models in an XSchema element 
(for reference from other XSchemas), why can't I store this one?

-- Ron Bourret

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