Since I have discovered the wonders of Docbook, I have been trying to use Docbook for almost anything.
This site has been prepared by SuSEFAQ DTD, which is an extension of Docbook Website XML DTD. Transformation of XML to html is done by customized Docbook XSL XSL stylesheets.
Well I have tried Vim, but to work flawlessly with Docbook, it looks to me Emacs and psgml is the true answer. I have now xslide also included which makes XML and XSL editing very effective.