Libbie,
30 minutes is a bit short to get into a full tutorial with XML, but it
is a good amount of time for a general introduction to the background
and content of the standard, and to get people using the same vocabulary
to talk about the data lifecycle.
I have some slides I would be happy to clean up and share if that would
be useful. When is the workshop? I am traveling this week but can
hopefully get them to you soon.
Cheers,
Jeremy