[xacml] Glossary Follow on

It was not clear if the lack of attendance at the last call on the glossary
was because of the time or lack of interest.

To make further progress, we could:

1. Get a volunteer to draft a new version.
2. Hold another telecon

If #2 is chosen, we need to know exactly who is going to attend, since it is
difficult to find a time that is convenient for both west coast and far
east.

Hal