Nameprep and NFKC

Abdulrahman I. ALGhadir aghadir at citc.gov.sa
Sun Oct 17 06:53:28 CEST 2010


Well I got it now I guess the behavior of the demo was a bit confusing
as you mentioned already so it supposed to rise an error or at least
show a notice of wrong input rather than showing the punycode without a
single notice.

Abdulrahman,

-----Original Message-----
From: John C Klensin [mailto:klensin at jck.com] 
Sent: 16/Oct/2010 5:04 PM
To: Abdulrahman I. ALGhadir; idna-update at alvestrand.no
Subject: RE: Nameprep and NFKC



--On Saturday, October 16, 2010 12:55 +0300 "Abdulrahman I.
ALGhadir" <aghadir at citc.gov.sa> wrote:

> So basically is that a flaw on the idna2008 demo or is it
> common behavior of the IDNA2008 or is it normalization problem
> (NFC) ? 

Vint's answer is the correct one -- it is deliberate behavior of
IDNA2008 and incorrect input into the demo.  I tried to say that
in an earlier note.   I do think that it would be useful to
alter the demo so that it makes a test for the input strings
being in NFC form (as required in Sections 4.1 and 5.2 of RFC
5891) and generates a clear error message if the test fails
rather than continuing to process the string.  I think that is
more a matter of taste rather than a "flaw" in the demo, but
your experience suggests to me that the demo would be more
useful if these strings were rejected with an explanation.

    john


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