Uml for schema has released (as a sub project) the doc4xslt package (a command line tool for documenting XSLT stylesheet)
First basic implementation has been committed on the CVS repository.
This implementation should be considered a prototype, and it is an absolutly non usable version
Please note that the stylesheets makes use of some extension functions,
which are implemented as saxon function extended element.
So if you want run the transformations you need the saxon XSL processor.
You can found it at saxon homepage http://saxon.sourceforge.net/