StyleBook is what MoinMoin currently emits when you click on the XML icon; note that often you won't even get well-formed XML, though. It is a variant of DocBook that was developed by some guy at IBM for the http://xml.apache.org/ project. However, the StyleBook project has not been updated since year 2000.
Stylebook is a project that handles generation of very complex documents, including HTML, and is used to generate the Cocoon documentation and web site. The Stylebook project is set to integrate with Cocoon in Cocoon 2.0. quoted from: http://www.onjava.com/pub/a/onjava/excerpt/java_xml_ch9/?page=last
Read more at:
Stylebook - An Introduction http://cscene.unitycode.org/topics/web/snibril-stylebook-intro.xml.html
Apache CVS - pretty useless http://cvs.apache.org/viewcvs.cgi/xml-stylebook/
Why doesn't MoinMoin use docbook-xml instead??