DOCBOOK-APPS: Text style for xrefs

Hi,

I am creating a cutomisation layer for the docbook dsssl, used with Jade 
and pdfTeX. I want to control the font weight of the text of a 
cross-reference (xref element) but I am at a loss as to which bit of the 
style sheet to modify.

Any help would be gratefully received...

Thanks,

Nick.

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From: Nick Hunt