draft-klensin-idnabis-protocol-04 section 4.5

Harald Tveit Alvestrand harald at alvestrand.no
Thu Mar 27 13:17:08 CET 2008

--On Thursday, March 27, 2008 10:55:04 +0100 Simon Josefsson 
<simon at josefsson.org> wrote:

> This section reads:
>    The resulting U-label is converted to an A-label (i.e., the encoding
>    of that label according to the Punycode algorithm [RFC3492] with the
>    prefix included, i.e., the "xn--..." form).
> That assumes that no U-label will be translated into a LDH-label.
> In IDNA2003 some U-labels are translated to LDH-labels, for example:
> ToASCII(josefßon) = josefsson
> ToASCII(dªtªkonsult) = datakonsult
> Note absence of xn-- prefix and punycode data.
> Is the intention that these strings will not map to the same LDH label
> in IDNA200x?

As long as we keep the "no mapping" principle, the intention is that these 
strings will be rejected by IDNA200x.


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