is there a sample docbook document somewhere?

as an aid to giving a seminar this week and next on docbook,
i'd like to present a simple DB document that demonstrates most
of the common elements, a little at a time.

  start simple, with inline stuff like emphasis, firstterm and so
on, go on to lists, programlistings, that sort of thing.

  is there, somewhere, a DB sample doc that, one section at
a time, demonstrates the use of the most typical elements?
if not, i can always throw together my own.

  thanks.

rday