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   Re: [xml-dev] Newbie Schema Restriction Question

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At 2006-04-21 15:56 -0400, I wrote:
>At 2006-04-21 14:51 -0400, Schneider, John Adam      CAR wrote:
>>I'm deriving types from UBL, some of which have elements which are required
>>by the specification.
>Your problem isn't UBL related, it is an issue with the derivation 
>you are attempting.

Just a quick postscript ... I've been reminded (thanks Mark) that 
even if you did fix your derivation then UBL NDR rules would kick in 
preventing you from creating your own elements in a UBL 
namespace.  Mechanically it might work but there is a layer of Naming 
and Design Rules that would disallow changed element definitions.

In the UBL committee we are working on documenting various extension 
methodologies that would be acceptable to the UBL rules.

One straw-man that has since been built upon is:


Right now we are looking at creating an optional extension element 
into which one would put their own extensions as shown at the link 
above using a non-UBL namespace for the immediate children of the 
extension element.

But the final documentation for this topic has not yet been prepared 
as we are awaiting more input and the maturing of some necessary tools.

I hope this helps.

  . . . . . . . . . Ken

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