Requirements for Rules Language

Hi,

from the minutes of our meeting in Atlanta we've the following open issue:

  "Do we need more detailed requirements for a specification language?
   Perhaps this falls out of the policy requirements draft, (implying
   that we need to put more details into the policy requirements
   drafts, rather than having a separate document)."

In general, if we need more detailed requirements, I think this should 
be part of the policy requirements drafts rather than having yet 
another separate document. Indeed, Section 3.2 of the "Requirements 
for Policy, Authorization and Enforcement" draft already spells out a 
few requirements, it seems natural to extend this section if 
necessary. Any thoughts on that?
Also, please post if you've more detailed requirements for the rules 
language in mind that should be written down.
Cheers,
  Markus