Re: [idn] Unicode tagging

[Keith Moore]

actually I think it's important to establish that no matter what IDN
does, this does not inherently affect *any* application - and explicitly
does not affect the data formats exchanged by applications.
each application must determine how to accomodate IDNs.

Keith

p.s. as one specific case, RFC822 is actually quite difficult to change.  
It is not as simple as using RFC 2047 encodings in email addresses.
It's not even clear that RFC 2047 is suitable for this purpose.
(speaking as author of RFC 2047)