Is a DocBook version of the DocBook TDG available?

I read in "Getting this book", http://docbook.org/tdg5/en/html/ch00.html#pref-getbook ,
that "You can also get this book ... as a DocBook document ... from ... http://docbook.org/."  

But, I looked all over and couldn't find a DocBook version of the latest V5.0 book.