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Re: XACML adding new functions

• To: xml-dev@l...
• Subject: Re: XACML adding new functions
• From: Seth Proctor <Seth.Proctor@S...>
• Date: Mon, 18 Aug 2003 17:42:29 -0400
• Organization:

[NOTE: I've only just subscribed to this list, so this issue may have 
 been addressed by someone else...apologies in advance if I'm adding
 duplicate information.]

Someone forwarded me a message posted here late last week about XACML
and function namespaces. In a nutshell, the answer is that the XACML
spec defines a standard namespace for functions, but that namespace is
_only_ for the standard functions defined in the specification. You
are free to define new functions, but they must be in a different 
namespace. Once you define your new function, there is no automatic
namespace addition in a policy. That is, if you define a new function 
called

  urn:foo:bar:baz:my-function

then you reference it in your policy as

  <Apply FunctionId="urn:foo:bar:baz:my-function">

The poster suggested that using the example in the programmer's guide,
the example function "bool-text-compare" would be referenced in a
policy as FunctionId="bool-text-compare", and yes, that's exactly
right.

Note that at the sourceforge pages for the open source implemenation
that I manage, there is a general discussion forum for exactly these
kinds of questions. Feel free to take further discussions there.
Anyone can subscribe to the list by going to

  http://lists.sourceforge.net/lists/listinfo/sunxacml-discuss

There's also a public archive of the list if you just want to browse
past discussions.


seth
--
Internet Security Research Group
Sun Microsystems Labs

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