Test XML file?

Could someone point me toward a test DocBook XML file?  My primary sources are DocBook: The Definitive Guide and Bob Stayton's DocBook XSL: The Complete Guide.  Haven't noticed anything like a test file, but I could have missed it.  Would prefer DOCTYPE book, but I'm not picky.  Thanks, and I know that I should probably just make one up myself.  I would prefer a known-good test case, if possible.

Thanks,
Mark Twenhafel
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