The Website doctype is a DocBookCustomization for making websites. It was created by NormanWalsh. The latest version is available in the files section of the DocBookOpenRepository.
A tutorial on website is available (2008) atDave Pawsons site
An annotated example of a site generated using the Website doctype is also available.
A Website consists of several single files in Website doctype and an index file named layout.xml that contains information about the structure.
Examples of sites that use the website, from a thread on the DocBookMailingList: