Hi Christian, Found the actual RFC: http://tools.ietf.org/html/rfc5646 Haven't found any documentation on how grade should be encoded. Maybe as part of the script tag? Corrections: On Thu 21/06/12,08:42, Mesar Hameed wrote: > On Wed 23/05/12,10:09, Christian Egli wrote: > > Something along the lines of the IETF language tag > > (http://en.wikipedia.org/wiki/IETF_language_tag) would probably be what > > we are looking for. > > Yes this looks reasonable > > If I understood it correctly en-GB-g2.ctb would be written as: en-GB-x-g2.ctb (unless we find a better way of encoding grade). a tag starting with x is a private use one and should be ok for us to use. x-8cb.ctb (8 dot computer braille) x-g0.ctb x-g1.ctb x-g2.ctb x-g3.ctb (grades 0-3 where applicable) x-def.cti (for chardefs) where ctb/utb are interchangable. Is this the sort of thing you were thinking of? Mesar For a description of the software, to download it and links to project pages go to http://www.abilitiessoft.com