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Subject: RE: [xacml] CD-1 issue #5: reverse order in <Match>

This is a small nuisance for some people, but probably not worth a
change to the specification.

Part of the problem is that <Apply> elements do not impose the same

When I prepared an HTML view of policies that showed both <Match> and
<Apply> conditions in the same format, one of the questions from users
was why the order of arguments differed.  I had to blame the syntax


> -----Original Message-----
> From: Erik Rissanen [mailto:erik@axiomatics.com] 
> Sent: Friday, September 11, 2009 08:09
> Subject: [xacml] CD-1 issue #5: reverse order in <Match>
> The issue number refers to the XLS-sheet found in this email:
> http://lists.oasis-open.org/archives/xacml/200909/msg00013.html
> The commenter proposes that it should be possible to switch 
> the order between the <AttributeDesignator> and the 
> <AttributeValue> in a <Match>.
> The value of this is unclear to me since a match function 
> would be done either with an equality predicate, for which 
> the order does not matter, or with some pattern matching 
> function, in which case the pattern matching function would 
> have been designed so that the order between the pattern and 
> the value to be matched fit the required order in a <Match>. 
> I cannot think of any case where this would not work, but 
> maybe there is some case? In the worst case, it would be 
> possible to define two variants of a matching function if 
> there would be a problem.
> But on the other hand, I don't think this would be a major change. 
> Perhaps it would affect how some implementation might do indexing?
> I propose that we do not change anything.
> Best regards,
> Erik
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