On Tuesday, March 27, 2012, 3:32:05 PM, Roderik wrote: RD> Eg. <example xml:lang=”nl”>Dit is een voorbeeld</example> RD> RD> <word xml:lang=”frisian”>Dit is een woord</word> The second example is not valid according to BCP-47 http://tools.ietf.org/html/bcp47 Language codes of five to 8 characters must be registered. the registry is here http://www.iana.org/assignments/language-subtag-registry Note that ISO 639-3 provides three codes for Frisian: frr|||Northern Frisian|frison septentrional frs|||Eastern Frisian|frison oriental fry||fy|Western Frisian|frison occidental http://www.loc.gov/standards/iso639-2/ISO-639-2_utf-8.txt ISO 639-1 notes that the unregistered term "Frisian" is deprecated in favour of "fy" http://id.loc.gov/vocabulary/iso639-1/fy.html -- Chris Lilley Technical Director, Interaction Domain W3C Graphics Activity Lead, Fonts Activity Lead Co-Chair, W3C Hypertext CG Member, CSS, WebFonts, SVG Working Groups