NDR specification of xsd:any in UBLExtension

["G. Ken Holman" <gkholman@CraneSoftwrights.com>]

Hi folks,

I've moved on to a more critical analysis of 
implementation guidelines and something caught my 
eye in the 2006-05-25 NDR document:

   http://www.oasis-open.org/committees/download.php/18372/NDR-2006-05-25-unmarked.pdf

Lines 643-646 reads as follows:  Any use of 
xsd:any should also allow no more than one 
element in the non-UBL namespace to ease 
serialization of the extending element as its own 
XML instance that can then be validated, if an 
implementer wishes to do so, outside the UBL validation process.

I'm thinking we should allow any number of 
extension elements below the UBL extension point, 
such that all systems (each of which may have 
their own extensions) will find what they need from the extension point.

As a real-world example, when I define low-level 
line-item detail to satisfy my legacy invoice 
layouts, I'll be putting that information under 
the extension point in a single child apex 
element for the top of all my extra stuff.  I can 
then print my legacy format while simultaneously 
satisfying the required UBL content for line items.

That same instance might need under the extension 
point a single child apex element for the North 
European Subset set of extensions so that I can 
send my invoice to be paid.  They get their 
line-level detail and ignore my Crane extension content.

So, in this case the one instance will have two 
elements, each in different namespaces, as 
children of the UBLExtension element.  This would 
not be allowed by the sentence I quoted (if I 
correctly understood the sentence).

But while I see the rule I quoted in prose, I do 
not see the rule in a named and boxed rule.  Can 
we remove the sentence and allow the UBLExtension 
element to have any number of children in non-UBL namespaces?

Thanks for considering this!

. . . . . . . . . . Ken

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