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Subject: RE: [xacml] CD-1 issue #16: offset for attribute selector

This could be added as an optional feature with no impact to existing
implementations.  I would like implementers to study the feasibility and
impact of this change.

See this thread for discussion and example:

Here is the use case that is illustrated in the example in that thread:
When defining a product structure from re-usable components, you want to
detect or prevent adding an export-controlled component into a
non-export-controlled assembly.  The rule can be written very simply by
using the ancestor list of each descendant node.  However, since the
initial context is always the root of <Content>, you can't do this.


> -----Original Message-----
> From: Erik Rissanen [mailto:erik@axiomatics.com] 
> Sent: Friday, September 11, 2009 08:13
> Subject: [xacml] CD-1 issue #16: offset for attribute selector
> 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 an attribute selector should 
> include an additional xpath parameter which acts as an offset 
> for the xpath of the selector.
> I see the that this could be useful, but it is a fairly big 
> change and I am uncertain about the implications so I propose 
> that we push this feature past 3.0 so we can consider it carefully.
> Best regards,
> Erik
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