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Re: Restrictions on existence of attributes?

• To: Chiusano Joseph <chiusano_joseph@b...>
• Subject: Re: Restrictions on existence of attributes?
• From: Robin Berjon <robin.berjon@e...>
• Date: Tue, 27 Jun 2006 16:14:59 +0200
• Cc: "xml-dev@l... Developers" <xml-dev@l...>
• In-reply-to: <74B14CBC0FEB9D4EB16969F09FA51F450111EC95@M...>
• References: <74B14CBC0FEB9D4EB16969F09FA51F450111EC95@M...>

On Jun 27, 2006, at 15:51, Chiusano Joseph wrote:
> Perhaps a reference to an attribute group, with a minOccurs and  
> maxOccurs of 1?

Nope, you can't have those on an attribute group, and if you could I  
guess you'd be setting the occurrences of the group, not of its  
individual members.

I'm fairly certain that it can't be done in XML Schema, at least not  
without a kludge like defining a type per attribute occurrence and  
casting the element with xsi:type — yummy! I left the dark magic door  
open because I never remember what a ·non-absent· {unfinal}  
[attributes] mixed element-only {content [item]} post-schema- 
validation-infoset-contribution used as a distinguished property  
value denoting absence can really do, but I don't think it can be  
done. Something about hitting the 20/80 sweet spot I think :)

-- 
Robin Berjon
    Senior Research Scientist
    Expway, http://expway.com/

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