contrib on titlepage, docbook v5

I've written a titlepage template and included the xsl in my 
cusomization layer.

I'm now seeing

authorname

contributorsname

contributorsname


How can I format (by prefixing it with 'contributor')
the author and contrib content please?




regards

-- 
Dave Pawson
XSLT XSL-FO FAQ.
http://www.dpawson.co.uk