PangoLanguage *lang;// language strings are specified as BCP 47: https://developer.gnome.org/pango/1.30/pango-Scripts-and-Languages.html#pango-language-from-string https://www.ietf.org/rfc/rfc3066.txt
case uiAttributeLanguage:
lang =pango_language_from_string((constchar*)(spec->Value));addattr(p, start, end,pango_attr_language_new(lang));// lang *cannot* be freed
break;