SM wrote: >> It merely means IETF documents MUST BE internationally legible, >> that is, pure ASCII. > Actually no, the text does not refer to IETF documents. Then, it depends on scope of the document and whether you need bi-directional communication or not (here after, bi-directional communication is assumed). If your scope is limited within UK, FR and DE, Latin-1 could be usable, within Europe (including countries using European languages/characters), unicode could be. But, if your scope includes CN and JP, unicode is useless for plain text communication but ISO-2022-JP-2 could be usable. If you need really international scope, pure ASCII is the only choice. Masataka Ohta _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf