Hoi,
Often this question about ISO 639 pops up and it is confused even more
by SIL codes.. Today the question about the mch code was raised..
http://www.ethnologue.com/show_language.asp?code=mch this clearly shows
that SIL now uses these codes on their website .. Consequently, there is
no need for the old SIL codes anymore.
Thanks,
GerardM