Re: Re: Standardizing on IDNA 2003 in the URL Standard

On Thu, Jan 16, 2014 at 10:07:36AM +0800, Jiankang Yao wrote:
>   In which section of rfc idnabis does say some meaning related to  that " "Aà.com" is not PVALID"?

Upper case characters are not PVALID.  This is because of B:
toNFKC(toCaseFold(toNFKC(cp))) != cp.  In appendix B.1 it's
illustrated in this entry:

> I check Aà.com in verisign conversion tool, it shows ""
> does it follow idna2003 instead of idnabis?

I have no idea.  Maybe it has a bug.  Or maybe it does case mapping
before it touches the string; that's what RFC 5895 suggests.  In that
case, of course, the Verisign conversion tool includes some things
that applications are supposed to do.


Andrew Sullivan

Received on Thursday, 16 January 2014 02:53:00 UTC