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Mark we have been over this repeatedly and the WG is well aware of the risk and side effects and has DECIDED to make the character pvalid. Please accept this. It is the consensus decision. V</font></div>
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<b>From</b>: <a href="mailto:idna-update-bounces@alvestrand.no">idna-update-bounces@alvestrand.no</a> <<a href="mailto:idna-update-bounces@alvestrand.no">idna-update-bounces@alvestrand.no</a>>
<br><b>To</b>: Michael Everson <<a href="mailto:everson@evertype.com">everson@evertype.com</a>>
<br>
<b>Cc</b>: IDNA update work <<a href="mailto:idna-update@alvestrand.no">idna-update@alvestrand.no</a>>
<br><b>Sent</b>: Mon Jul 20 05:35:05 2009<br><b>Subject</b>: Re: Eszett
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<font size="2">My apologies, I gave the wrong examples. Here are the corrected ones:<br><br></font><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). Similarly, it would have been possible to separate σ/ς (again, joined because they have a common uppercase Σ).<br></font><font size="2">
<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. We have two effective options:</font><font size="2"><br>
</font>
<div><h4><font size="2"><a name="TOC-A.-Maintain-compatibility-with-IDNA"></a></font><font size="2">A. Maintain compatibility with IDNA2003</font></h4>
<table style="margin-left: 40px;" border="1" cellpadding="3" cellspacing="0">
<tbody>
<tr bgcolor="#cccccc">
<td><font size="2"><b>
URLs</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://www.xn--mxads7ake1d.gr">http://www.γιατρός.gr</a><br><a href="http://www.xn--mxads7ake1d.gr">http://www.γιατρόσ.gr</a><br><a href="http://www.xn--mxads7ake1d.gr">http://www.ΓΙΑΤΡΌΣ.gr</a><br>
</font></td>
<td> <font size="2"><a href="http://www.%CE%B3%CE%B9%CE%B1%CF%84%CF%81%CF%8C%CF%83.gr/" rel="nofollow" target="_blank">http://www.xn--mxads7ake1d.gr</a></font></td>
<td><font size="2"><b>always</b></font>
</td>
</tr>
<tr>
<td><font size="2"><a href="http://www.weltfussball.at">http://www.weltfußball.at</a><br><a href="http://www.WELTFU">http://www.WELTFU</a>ẞBALL.at<br><a href="http://www.weltfussball.at">http://www.weltfussball.at</a><br>
<a href="http://www.WELTFUSSBALL.at">http://www.WELTFUSSBALL.at</a><br></font></td>
<td><font size="2"><a href="http://www.weltfussball.at/" rel="nofollow" target="_blank">http://www.weltfussball.at</a></font></td>
<td><font size="2"><b>always</b></font>
</td>
</tr>
</tbody>
</table>
<p style="margin-left: 40px;">
</p>
<h4><font size="2"><a name="TOC-B.-Deviate-from-IDNA2003"></a></font><font size="2">B. Deviate from IDNA2003</font></h4><font size="2">Try to separate them, leaving users with a de-facto indeterminant mapping. That results in the following:<br>
<br></font> <table style="margin-left: 40px;" border="1" cellpadding="3" cellspacing="0">
<tbody>
<tr bgcolor="#cccccc">
<td><font size="2"><b>
URLs</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 rowspan="2"><font size="2"><a href="http://www.xn--mxads7ake1d.gr">http://www.γιατρός.gr</a></font></td>
<td><font size="2"><a href="http://www.xn--mxads7afk1d.gr/" rel="nofollow" target="_blank">http://www.xn--mxads7afk1d.gr</a></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://www.%CE%B3%CE%B9%CE%B1%CF%84%CF%81%CF%8C%CF%83.gr/" rel="nofollow" target="_blank">http://www.xn--mxads7ake1d.gr</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://www.xn--mxads7ake1d.gr">http://www.γιατρόσ.gr</a><br><a href="http://www.xn--mxads7ake1d.gr">http://www.ΓΙΑΤΡΌΣ.gr</a><br></font></td>
<td> <font size="2"><a href="http://www.%CE%B3%CE%B9%CE%B1%CF%84%CF%81%CF%8C%CF%83.gr/" rel="nofollow" target="_blank">http://www.xn--mxads7ake1d.gr</a></font></td>
<td><font size="2"><b>always</b><br>
</font>
</td>
</tr>
<tr>
<td rowspan="2"><font size="2"><a href="http://www.weltfussball.at">http://www.weltfußball.at</a><br><a href="http://www.WELTFU">http://www.WELTFU</a>ẞBALL.at<br></font></td>
<td><font size="2"><a href="http://www.xn--weltfuball-b4a.at/" rel="nofollow" target="_blank">http://www.xn--weltfuball-b4a.at</a></font></td>
<td><font size="2"><b><span style="color: rgb(153, 0, 0);">sometimes</span></b></font></td>
</tr>
<tr>
<td> <font size="2"><a href="http://www.weltfussball.at/" rel="nofollow" target="_blank">http://www.weltfussball.at</a></font></td>
<td><font size="2"><b><span style="color: rgb(153, 0, 0);">sometimes</span></b></font></td>
</tr>
<tr>
<td><font size="2"> <a href="http://www.weltfussball.at">http://www.weltfussball.at</a><br><a href="http://www.WELTFUSSBALL.at">http://www.WELTFUSSBALL.at</a><br></font></td>
<td> <font size="2"><a href="http://www.weltfussball.at/" rel="nofollow" target="_blank">http://www.weltfussball.at</a></font></td>
<td><font size="2"><b>always</b></font></td>
</tr>
</tbody>
</table>
<div style="margin-left: 40px;"><font size="2"><br>
</font>
</div>
<font size="2">Why would this happen? Well, for some indefinite
period
time, both IDNA2003 and IDNA2008 clients will exist. So you get on a
friend's machine, go to your bank site, and get to a spoof site.
Moreover, in
an effort to maintain compatibility for clients, most
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 leads to the spoof site.<br></font></div><font size="2">
<br>
Now perhaps the NICs for de, at, and ch will address </font><font size="2">ß/ẞ/ss/SS (and the NIC for gr will address </font><font size="2"> σ/ς/Σ</font><font size="2">)</font><font size="2"> 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 -- not to speak of the many, many more
registries below the top level.<br></font>