[Ietf-calsify] Section 4.1 Content Lines: NON-US-ASCII

[Bernard Desruisseaux]

Bernard Desruisseaux wrote:
> In section 4.1 Content Lines of RFC 2445 it says:
> 
>  >     NON-US-ASCII       = %x80-F8
>  >     ; Use restricted by charset parameter
>  >     ; on outer MIME object (UTF-8 preferred)
> 
> Unless I'm mistaken, the characters %xF9 to %xFD are allowed in UTF-8.

It seems I was mistaken.

I had come to this quick conclusion by reading the following
statement in RFC 2279:

- The octet values FE and FF never appear.

But RFC 3629 which obsoletes RFC 2279 specify has the following
statement instead:

- The octet values C0, C1, F5 to FF never appear.

As such, the NON-US-ASCII rule should be:

   NON-US-ASCII       = %x80-BF / %xC2-F4

Cheers,
Bernard

> 
> At a minimum this should be:
> 
>  >     NON-US-ASCII       = %x80-FD
> or
>  >     NON-US-ASCII = UTF8-2 / UTF8-3 / UTF8-4
>  >     ; UTF8-2, UTF8-3, and UTF8-4 are defined in RFC 3629.
> 
> and if we agree to support ISO-8859-1, then it should be:
> 
>  >     NON-US-ASCII       = %x80-FF
> 
> Cheers,
> Bernard
> 
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