[idn] Correction to draft-ietf-idn-idne-00

[Paul Hoffman / IMC <phoffman@imc.org>]

Greetings again. Marc and I made a pretty bad mistake in the example 
in draft-ietf-idn-idne-00 that was caught by François Yergeau. We 
have turned in the -01 draft (with a few other minor changes), but 
wanted to get the corrected example to the list in case anyone was 
wondering what the heck it was that we were thinking.

3.1.1 Basic example

The following example shows the label me.com where the "e" in "me" is
replaced by a <LATIN CAPITAL LETTER E WITH ACUTE>, which is U+00C9. The
decomposition and downcasing specified in [NAMEPREP] changes the second
character to <LATIN SMALL LETTER E WITH ACUTE>, U+00E9. This string is
then transformed using UTF-8 [RFC2279] to 0x6DC3A9.

Ignoring the other fields of the message, the domain name portion of the
datagram could look like:

         +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
      20 | 0  1  0  0  0  0  1  0| 0  0  0  0  0  0  1  1|
         +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
      22 |         0x6D (m)      |       0xC3 (e'(1))    |
         +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
      24 |         0xA9 (e'(2))  |       3               |
         +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
      26 |         0x63 (c)      |       0x6F (o)        |
         +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
      28 |         0x6D (m)      |       0x00            |
         +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

Octet 20 means EDNS extended label type (0b01) using the IDN label
       type (0b000010)
Octet 21 means size of label is 3 octets following
Octet 22-24 are the "m*" label encoded in UTF-8
Octet 25-28 are "com" encoded as a STD13 label
Octet 29 is the root domain

--Paul Hoffman, Director
--Internet Mail Consortium