CD-1 issue #6: categories for web services

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 we defined two standard attribute categories 
for web service access control.

I think this is more suitable for the WS-XACML profile, which has 
assorted features for web service access control.

Best regards,
Erik