<font size="2">If we were starting with a blank slate, it would be feasible to have
ß/ẞ kept separate from ss/SS (although note that the German national
standards body doesn't: the uppercase of ß is SS, which is why they got
connected in the first place in Unicode).<br><br><b>But we are not starting with a clean slate: </b>we are facing with changes to an
existing widely-deployed standard, over 6 years old, which is a long time in terms of the web<a href="http://%c3%b6bb.at/"></a>. We have two options.<br></font>
<h3><font size="2">A. Maintain compatibility with IDNA2008:</font></h3>
<table border="1" cellpadding="3" cellspacing="0">
<tbody>
<tr bgcolor="#cccccc">
<td><font size="2"><b>
URL
</b></font></td>
<td><font size="2"><b>
Result<br>
</b></font>
</td>
<td><font size="2"><b>When</b></font></td>
</tr>
<tr>
<td><font size="2"><a href="http://xn--bb-eka.at">http://ÖBB.at</a></font></td>
<td rowspan="2"><font size="2"><a href="http://xn--bb-eka.at">http://xn--bb-eka.at</a></font></td>
<td rowspan="2"><font size="2"><b>always</b></font>
</td>
</tr>
<tr>
<td><font size="2"><a href="http://xn--bb-eka.at">http://öbb.at</a></font></td>
</tr>
</tbody>
</table>
<p>
</p>
<h3><font size="2">B. Try to separate them, leaving users with a de-facto indeterminant mapping. </font></h3>
<table border="1" cellpadding="3" cellspacing="0">
<tbody>
<tr bgcolor="#cccccc">
<td><font size="2"><b>
URL
</b></font></td>
<td><font size="2"><b>
Result<br>
</b></font>
</td>
<td><font size="2"><b>When</b></font></td>
</tr>
<tr>
<td><font size="2"><a href="http://xn--bb-eka.at">http://ÖBB.at</a>
</font></td>
<td><font size="2"><a href="http://xn--bb-">http://xn--bb-</a><b style="color: rgb(153, 0, 0);">nha</b>.at
</font></td>
<td style="color: rgb(153, 0, 0);"><font size="2"><b>sometimes</b></font>
</td>
</tr>
<tr>
<td><font size="2"><a href="http://xn--bb-eka.at">http://ÖBB.at</a></font></td>
<td><font size="2"><a href="http://xn--bb-eka.at">http://xn--bb-eka.at</a></font></td>
<td><font size="2"><b><span style="color: rgb(153, 0, 0);">sometimes</span></b><br></font>
</td>
</tr>
<tr>
<td><font size="2"><a href="http://xn--bb-eka.at">http://öbb.at</a></font></td>
<td><font size="2"><a href="http://xn--bb-eka.at">http://xn--bb-eka.at</a></font></td>
<td><font size="2"><b>always</b><br></font>
</td>
</tr>
</tbody>
</table>
<div><font size="2"><br></font>
</div>
<div><font size="2">Why would this happen? Well, for some indeterminant time, both idna2003 and idna2008 clients will exist. So you send an email with your favorite
bank to friends, and the site they go to is a spoof site. Moreover, in an effort to maintain compatibility for clients, some
client-software will do a dual lookup; first try one then the other. If
someone comes in with an intervening registration, for a spoof site,
then a URL that used to work for you now fails.<br><br>
Now perhaps the NICs for de, at, and ch will address this by bundling
or blocking. But bundling or blocking defeats the purpose of separating
them, and there is little reason to think that .com, .biz, .whatever
will all do the same; and that is not to speak of the many, many more
registries below the top level.<br></font>
</div><font size="2"><br><br clear="all">Mark<br><br><br></font>
<div class="gmail_quote"><font size="2">On Sun, Jul 12, 2009 at 03:13, Cary Karp <span dir="ltr"><<a href="mailto:ck@nic.museum" target="_blank">ck@nic.museum</a>></span> wrote:<br></font><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><font size="2">> I just hope that ß/ẞ are left alone and not conflated with esses at<br>
> least not by us; a registrar may wish to do so.<br><br></font>
</div><font size="2">That's what I feel, as well.<br></font>
<font color="#888888" size="2"><br>
/Cary<br>
</font><div><div><font size="2">______________________________</font><font size="2">_________________<br>
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</font>
</div></div></blockquote></div><font size="2"><br></font>