http://stackoverflow.com/questions/2615002/how-to-generate-pdf-from-docbook-5-0

Serna Free - Open Source XML Editor

http://j1m.net/2010/08/29/duck-duck-gnu-mallard-and-docbook-5-support-in-emacs/

Important:

http://www.cuddletech.com/blog/pivot/entry.php?id=509

DocBook 5 Example:

http://canne.wordpress.com/2007/03/30/docbook-5-book-template/

I've compiled my unexbook with:

xsltproc --xinclude -o test.html /usr/share/xml/docbook/stylesheet/docbook-xsl-ns/html/docbook.xsl unexbook.xml