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   Re: XSchema Spec - XSchema Element (Sections 2.0 and 2.1), Draft 4

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  • From: rbourret@dvs1.informatik.tu-darmstadt.de (Ron Bourret)
  • To: xml-dev@ic.ac.uk
  • Date: Fri, 10 Jul 1998 16:43:52 +0200

> Major Question: Do we want Attribute declarations allowed outside of element 
> declarations?  If yes, we need to do that here.  This will be fairly minor 
> surgery; the AttDef element will also need a new attribute for its parent 
> element.  The XML 1.0 spec doesn't have any such production - it just uses 
> Name.

I vote yes.  There are two reasons, both for user convenience.  First, it allows 
multiple attribute declarations for the same element; in this case, the Element 
attribute of the AttList element points to the relevant ElementDecl.  Second, it 
is a convenient shorthand for an attribute applying to all elements; in this 
case, the Element attribute of the AttList element is omitted.

> 2.1 The XSchema Element
> [snip]
> The XSC:XSchema element contains other elements describing the XSchema and 
> building a schema. These elements are described in later sections of this 
> specification. The XSC:XSchema element may also contain other XSC:XSchema 
> elements nested inside of it.

I think it would be useful to explain further why an XSchema might be nested 
under another XSchema.  In my mind, the major reason is reusability -- this 
structure means that the contents of two XSchemas can simply be placed inside 
the contents of a third XSchema.

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