<br><br><div class="gmail_quote">On Sat, Aug 29, 2009 at 5:17 PM, John C Klensin <span dir="ltr"><<a href="mailto:klensin@jck.com">klensin@jck.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
--On Monday, August 24, 2009 23:24 -0400 Andrew Sullivan<br>
<div class="im"><<a href="mailto:ajs@shinkuro.com">ajs@shinkuro.com</a>> wrote:<br>
<br>><br>
> In a previous comment (see<br>
> <a href="http://www.alvestrand.no/pipermail/idna-update/2009-July/00497" target="_blank">http://www.alvestrand.no/pipermail/idna-update/2009-July/00497</a><br>
> 0.html), I made a vague remark about something I find<br>
> worrisome in this text in §<a href="http://2.3.2.1" target="_blank">2.3.2.1</a>:<br>
</div>>...<br>
<br>
These changes, with Paul's suggested modifications, have been<br>
tentatively accepted and incorporated in the document. Anyone<br>
who objects should say so quickly.<br>
<br>
</blockquote><div><br></div><div>I posted a comment related to the definition of A-label some time ago, but the thread was digressed: <a href="http://www.alvestrand.no/pipermail/idna-update/2009-June/004558.html">http://www.alvestrand.no/pipermail/idna-update/2009-June/004558.html</a></div>
<div><br></div><div>The issue is with case variants of A-labels. By DNS rules, as mentioned in several places in the idnabis-defs draft, A-labels are to be compared in a case independent manner. However, if certain characters in an A-label have been uppercased, the Punycode decoding algorithm (due to its mixed-case annotation feature) may produce invalid U-label because the ASCII characters will be in capital letter form.</div>
<div><br></div><div>=wil</div></div>