DocBook: more complete docs?

[Toshio Kuratomi <badger prtr-13 ucsc edu>]

Where can we find reference type material on DocBook?  I've somewhat outgrown
the tutorial and I'm hankering to move on.  I've started using the gtt-db.sgml
file as a way to learn more, but I feel like I might be missing some things
that I might find valuable or that I'll discover some tag farther into the
gtt file that I've been wanting to apply to my documentation all along.

Thanks!
-Toshio
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