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   Re: XML Schemas: <all> + extension = ?

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  • From: ht@cogsci.ed.ac.uk (Henry S. Thompson)
  • To: "Roger L. Costello" <costello@mitre.org>
  • Date: 10 Jul 2000 10:29:12 +0100

"Roger L. Costello" <costello@mitre.org> writes:

> Hi Folks,
> I am wishing to create a complexType which extends a base type.  I would
> like for the resulting set of elements to be unordered (using <all>).  
> Here's an example to demonstrate what I mean.  Suppose that I have a
> base type called appliance, and the elements in this base type are
> unordered:
> <complexType name="appliance">
>     <all>
>         <element name="description" type="string" maxOccurs="1"/>
>         <element name="warranty" type="string" maxOccurs="1"/>
>     </all>
> </complexType>
> Now I would like to create another type, juiceAppliance, which extends
> appliance.  Further, I would like for the resulting set of elements to
> be unordered.  Here was my first attempt at doing this:

Can't be done as the design stands.  Derived types observe one of two

restriction) all members of derived type are members of base type
extension) all members of derived type contain members of base type as 
           a prefix.

If we provided for your use case that would break the second

  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/

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