Below is a list of web sites where more information and the additional material can be found.
The Oasis pages http://www.oasis-open.org/docbook/
DocbBook: The Definitive Guide by Norman Walsh and Leonard Muellner http://docbook.org/tdg/en/html/docbook.html
DocbBook XSL: The Complete Guide by Bob Stayton http://www.sagehill.net/docbookxsl/index.html
EPUB zone: The International Digital Publishing Forum (idpf) http://www.idpf.org
The XmlPad editor http://www.wmhelp.com/
The Notepad++ editor http://notepad-plus-plus.org/
Download the Docboook V4.5 archive from the Oasis site http://www.oasis-open.org/docbook/xml/4.5/
Download the Docbook xsl 1.76.1 archive from the sourceforge page http://sourceforge.net/projects/docbook/files/docbook-xsl/
Download the Saxon transformer 6.5.5 from the sourceforge page http://saxon.sourceforge.net/#F6.5.5
Download Apache's FOP (Formatting Objects Processor) 1.1 fop-1.1-bin.zip from the Apache page http://xmlgraphics.apache.org/fop/
Download Apache's offo (Objects for Formatting Objects) offo-hyphenation-binary.zip from the Apache page http://offo.sourceforge.net/hyphenation/index.html
Additional tools
Download Adobe Digital Edition for epub documents viewing http://www.adobe.com/fr/products/digital-editions/download.html
The examples in this book can be imported as a project into Eclipse from this Github location (provided your Eclipse environment supports Git) https://github.com/patricecotte/XMLPublisher.git . Or go to Github and copy the elements you need.