It does not have to be formally required in the protocol. I like the way the current documents separate out any notion of preprocessing so that it is not in the base protocol. And for many implementations it will be sufficient; they will not require any preprocessing.<br>
<br>However, for many implementations the use of preprocessing will be absolutely required in practice, and it had better be the same across them.<br><br>The main point is that preprocessing is not limited to UIs; there are a wide variety of mechanical processes that interpret textual URLs - not only browsers in href attributes, but many other programs do it in flowing text, such as email clients, word processors, even spreadsheets. People often paste what they have typed into an address bar into that text, and they will expect the same degree of case-insensitivity and variant insensitivity that has been present in IDNA2003.<br>
<br> I've said this before on this list, but for those joining later, here's a sample.<br>
<br>
<a href="http://www.alvestrand.no/pipermail/idna-update/2007-April/000542.html">http://www.alvestrand.no/pipermail/idna-update/2007-April/000542.html</a><br><br>Mark<br><br><div class="gmail_quote">On Tue, Mar 18, 2008 at 1:21 PM, Paul Hoffman <<a href="mailto:phoffman@imc.org">phoffman@imc.org</a>> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="Ih2E3d">At 11:25 AM -0700 3/18/08, Mark Davis wrote:<br>
>For more information on possible preprocessing, see the rough draft<br>
>at <a href="http://docs.google.com/Doc?id=dfqr8rd5_51c3nrskcx" target="_blank">http://docs.google.com/Doc?id=dfqr8rd5_51c3nrskcx</a>.<br>
<br>
</div>The steps there look interesting. However, I'm *very* concerned with<br>
putting this forward with the current wording in the document, given<br>
that it goes against one of the core changes in IDNA200x from the<br>
design team, namely that pre-processing is optional. The fact that<br>
you mention the possible need for post-processing makes that even<br>
more poignant.<br>
<br>
If you mean this proposal to be optional, please reword it a bit more<br>
carefully for that. If you mean it to be required, then that might<br>
cause a reset of the charter.<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Mark