Letters or CV in DocBook?

Hi,

coming from LaTeX, it feels natural to use the same documentation
system for both technical documentation and for letters or the CV.
Since I use DocBook exclusively for all kind of documentation, it
would be nice not to have to fallback to LaTeX for these documents.
Does anybody already defined schemas (Relax NG or other) based on
current DocBook for this? Do XSL stylesheets exist to create PDFs?

Cheers!