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

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  • From: John Cowan <cowan@locke.ccil.org>
  • To: XML Dev <xml-dev@ic.ac.uk>
  • Date: Fri, 10 Jul 1998 11:28:55 -0400

Ron Bourret wrote:

> > 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.

I agree.

> 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.

Nested XSchemas also allow you to precisely specify the scope of
Doc elements.

John Cowan	http://www.ccil.org/~cowan		cowan@ccil.org
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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