[xacml-comment] Section 8.2 "Extensible XACML attribute types" needsrevision

Section 8.2 is a bit garbled, and now that we have
SubjectCategory as an XML attribute instead of an XACML
Attribute, it needs re-wording anyway.  Here is my proposal:

1. Eliminate Section 8.2.  Now that subject-category is not an
   XACML attribute, there are no longer any XACML-defined
   AttributeIds that have pre-defined, but extensible, values.

2. Add "SubjectCategory" to the list of "Extensible XML attribute
   types" in Section 8.1.

Anne Anderson
-- 
Anne H. Anderson             Email: 
Sun Microsystems Laboratories
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Burlington, MA 01803-0902 USA  Fax: 781/442-1692