Does this look ok?
Looks good to me. A strawman -05 document incorporating Pasi and Alan's comments is available here:
http://www.drizzle.com/~aboba/RADEXT/draft-ietf-radext-filter-05.txt -- to unsubscribe send a message to radiusext-request@ops.ietf.org with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/radiusext/>