GPL and XML and Schemas

Wrt code, GPL/LGPL seems comprehensible.
For documentation there is FDL.

Has anyone gone through the hassle of working out what's appropriate
for xml, particularly schemas? Doesn't seem to match LGPL definition
of 'l'ibrary; Isn't documentation and isn't code.



TIA

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