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RE: Subtyping in XML

• To: "Jeff Lowery" <jlowery@s...>,<ht@c...>,"Paul Prescod" <paulp@p...>
• Subject: RE: Subtyping in XML
• From: "Dare Obasanjo" <dareo@m...>
• Date: Thu, 5 Sep 2002 10:13:52 -0700
• Cc: <xml-dev@l...>
• Thread-index: AcJU/TPZBG8CVnluTM2dpezTpRgFwwAAMk3g
• Thread-topic: Subtyping in XML

Ahh, redefinition. This isn't really type derivation since redefinition
is pervasive. Actually it is much worse especially since you can't
prevent redefinition like you can derivation or substitution. 

-- 
PITHY WORDS OF WISDOM 
In any contest between power and patience, bet on patience.      

This posting is provided "AS IS" with no warranties, and confers no
rights. 

>  
>  
> -----Original Message-----
> From: Jeff Lowery [mailto:jlowery@s...] 
> Sent: Thursday, September 05, 2002 9:55 AM
> To: 'ht@c...'; Paul Prescod
> Cc: xml-dev@l...
> 
> Okay, I've got my mind right. 
> 
> It's not an enumeration of simpletype values that I remember, 
> but more along the lines of Paul's example, below.  The 
> example is from Eric vdV's book, p.
> 203 (paraphrased below):
> 
> <group name="name">
>     <choice>
>          <element ref="a"/>
>          <element ref="b"/>
>     </choice>
>  </group>
> 
> <redefine schemaLocation="foo.xsd">
>        <group name="name">
>               <choice>
>                   <group ref="name"/>
>                  <element ref="c"/>
>               </choice>
>         </group>
> </redefine>
> 
> Quoth:  "... the effect of this redefinition is to allow a 
> new element ([c]) to be accepted instead of a [a] or [b]."
> 
> 
> 
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