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Re: How to *not* specify the order of occurrence?

From: Joe Kesselman <keshlam.cat.nospam@-------.--->
To: NULL
Date: 7/3/2009 1:03:00 PM
C. M. Sperberg-McQueen wrote:
> But if the OP's description of the goal is correct (allow any
> order, and mark elements required or optional) and the example
> is characteristic (none of the elements in question appears more
> than once), the xsd:all can do what appears to be required.

Hmmm. You're certainly an authority on the topic... but I'm confused by 
why I didn't notice this before. I need to re-read that, clearly. Thanks.

 > (If the order has no significance,
> there is really very little reason to allow the order to vary.
> Variable but meaningless ordering is also a method of
> steganography, which may worry some security people.)

Agreed. But sometimes convincing the customer that laziness is not 
sufficient justification for allowing reordering can be difficult. And 
there are other steganography opportunities in XML unless you spend the 
cycles to normalize it. (Admittedly, element order is one that would 
survive canonicalization.)


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