Topichead does not allow @keys

Just noticed that at least in my copy of the 1.2 DTDs, topichead does not
allow the @keys attribute.

I think this must be a bug as we have established through separate
discussion and decisions that, using chunk, it can be meaningful to address
a topichead in order to either address it as a unit of navigation or as a
reference to a topic (whose existence is implied by a @chunk value).

Cheers,

E.

----
Eliot Kimber | Senior Solutions Architect | Really Strategies, Inc.
email:   <mailto:>
office: 610.631.6770 | cell: 512.554.9368
2570 Boulevard of the Generals | Suite 213 | Audubon, PA 19403
www.reallysi.com <http://www.reallysi.com>  | http://blog.reallysi.com
<http://blog.reallysi.com> | www.rsuitecms.com <http://www.rsuitecms.com>