draft-klensin-idnabis-protocol-04 section 4.5
simon at josefsson.org
Thu Mar 27 10:55:04 CET 2008
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
More information about the Idna-update