internal identifier

localised name (formatted in the current user's locale)

should this value be available on the XTRF selection lists

should this value be available on the top of XTRF selection lists, in the Preferred section

specific symbol or abbreviation

<a href="http://en.wikipedia.org/wiki/List_of_ISO_639-1_codes">ISO 639-1 code</a>

<a href="http://en.wikipedia.org/wiki/List_of_ISO_639-2_codes">ISO 639-2 code</a>

should this value be set by default in XTRF selection lists