[docbook] TDG 5: DocBook sources?

[Michael Valent]

Hello!

I dimly remember that years ago (4.4?) I could download the original DocBook 
sources of The Definitive Guide somewhere. This is the ideal showcase (where 
else can you find _all_ elements, properly used, in one place?).

Now I've tried to find the DocBook sources of TDG5, but had no success so far.

Can anybody help?

Thanks in advance
Michael Valent