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Subject: Re: [xacml-users] Fwd: one question regarding obligations in XACML

On Sun, 2004-10-10 at 21:21, Anne.Anderson@sun.com wrote:
> Could Michiharu or another obligations expert try to respond to this?

This was a private email sent to me, and I already responded to it
privately. Since you've forwarded it to a public list...

In a nutshell, you're free to define whatever contraints you like, in
whatever format you like. The PDP doesn't actually process your
Obligations, so as long as you express your Obligations using valid
attributes, you can use any syntax you like.

In this case, you could include a specific requirement written in the
XACML Condition syntax, since XACML can express these kinds of time
constraints. You couls also write some simpler notation that the PEP
will understand. In terms of the requirement being passed back, it's
fine to impose this kind of time-related requirement, though you could
also just express it as part of the policy for the specific example of
date/time values.

Basically, Obligations are intentionally under-specified. You need to
define the relationship between your PEP and PDP, and how your PEP will
interpret the Obligations. Beyond that, you've free to define whatever
functionality you like.


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