Re: Revisiting RFC 2822 grammar

Graham Klyne wrote:

> At 22:26 20/01/04 +0000, (someone) wrote:
>
> > >But maybe it should be " 4DIGIT / %x31-39 3*DIGIT / obs-year ", i.e.
> > >years with more than 4 digits must not have leading zeros.
>
> Er, shouldn't that be:
>
>   4DIGIT / %x31-39 4*DIGIT / obs-year
>
> to avoid syntactic ambiguity between the first and second options?
Why treat 4-digit years with leading zeros specially?  I.e. that allows:
0001
0099
0345

Why not:

   %x31-39 3*DIGIT / obs-year