The Selfdocbook is a self-documenting introduction to DocBook DocBook book. It includes its own DocBook SGML source in the appendix, and so can be used to learn DocBook by example.
You can get a copy of the Selfdocbook in various ways; presumably you already know one of them since you are reading the Selfdocbook right now. Here are the choices:
View it using a web browser, by pointing it to the Selfdocbook web page.
Grab the PostScript version, ready to print out.
Download the PDF version, if that's your preferred format.
Fetch the DocBook SGML source and build it.
You can use the Selfdocbook to learn DocBook by example: if you see something that you want to know how to do, you can simply flip to Appendix A to find out how it is done.
I learned DocBook from the excellent book DocBook: The Definitive Guide by O'Reilly Associates, also available online. It is probably a good idea to have a glance through that in order to get more of an overview than this book provides.
This Selfdocbook was built on 23 May 2003.