<a href="http://unicode.org/Public/UNIDATA/UnicodeData.txt" target="_blank">http://unicode.org/Public/UNIDATA/UnicodeData.txt</a> is only part of the Unicode data; if you only look at that file, you get a very incomplete view of the Unicode data and properties. It doesn't list reserved characters, so for example, <br>
<pre>F0000;<Plane 15 Private Use, First>;Co;0;L;;;;;N;;;;;<br>FFFFD;<Plane 15 Private Use, Last>;Co;0;L;;;;;N;;;;;<br>100000;<Plane 16 Private Use, First>;Co;0;L;;;;;N;;;;;<br>10FFFD;<Plane 16 Private Use, Last>;Co;0;L;;;;;N;;;;;<br>
</pre>You don't see the code points U+FFFFE and U+FFFFF either. The fact that Unicode goes from 0..10FFFF is in the core specification (see <a href="http://www.unicode.org/versions/Unicode5.2.0/">http://www.unicode.org/versions/Unicode5.2.0/</a>). UTS #44 Unicode Character Database (<a href="http://www.unicode.org/reports/tr44/">http://www.unicode.org/reports/tr44/</a>) should also be referenced, since it explains the data formats.<br>
<br>As for the titles, I think the more important feature is having either all or none of them start with "Internationalized Domain Names for Applications (IDNA):", and having Tables and Bidi in in the titles.<br>
<br clear="all">Mark<br>
<br><br><div class="gmail_quote">On Fri, Nov 20, 2009 at 13:16, Harald Alvestrand <span dir="ltr"><<a href="mailto:harald@alvestrand.no" target="_blank">harald@alvestrand.no</a>></span> 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>Mark Davis ☕ wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I noticed in <a href="http://tools.ietf.org/id/draft-ietf-idnabis-tables-07.txt" target="_blank">http://tools.ietf.org/id/draft-ietf-idnabis-tables-07.txt</a> the following:<br>
<br>
E01F0..EFFFD; UNASSIGNED # <reserved>..<reserved><br>
<br>
EFFFE..10FFFE; DISALLOWED # <noncharacter>..<noncharacter><br>
It is missing 10FFFF.<br>
</blockquote>
<br></div>
The Unicode data table /UnicodeData.txt) doesn't tell us what 10FFFE and 10FFFF are; the last character listed is 10FFFD (Plane 16 Private Use, Last).<br>
<br>
On the other hand, Blocks.txt says:<br>
<br>
unicode/Blocks.txt:100000..10FFFF; Supplementary Private Use Area-B<br>
<br>
So is there a distinction between 10FFFD, 10FFFE and 10FFFF, and does this document need to make that distinction?<br>
<br>
(I think it's unreasonable to allow any of them in domain names, so they should all be DISALLOWED, but i'm not surprised that there's inconsistencies here.)<div><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
The titles of the documents are inconsistent: The first three below have a prefix, and the last 3 are missing it. Also, the first three use titlecase (Background, Explanation, and Rationale have B, E, and R capitalized), and the next two don't. It might also be nice to have "BIDI" someplace in "Right-to-left scripts for IDNA", and "Tables" somewhere in "The Unicode code points and IDNA"<br>
</blockquote></div>
The RFC Editor has strong opinions on where to use titlecase. I always get changes when I submit RFCs, so I have left that evaluation on his table.<br>
<br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
* Internationalized Domain Names for Applications (IDNA):<div><br>
Definitions and Document Framework -<br>
<a href="http://tools.ietf.org/html/draft-ietf-idnabis-defs" target="_blank">http://tools.ietf.org/html/draft-ietf-idnabis-defs</a><br>
* Internationalized Domain Names in Applications (IDNA): Protocol<br>
- <a href="http://tools.ietf.org/html/draft-ietf-idnabis-protocol" target="_blank">http://tools.ietf.org/html/draft-ietf-idnabis-protocol</a><br>
* Internationalized Domain Names for Applications (IDNA):<br>
Background, Explanation, and Rationale -<br>
<a href="http://tools.ietf.org/html/draft-ietf-idnabis-rationale" target="_blank">http://tools.ietf.org/html/draft-ietf-idnabis-rationale</a><br>
* Right-to-left scripts for IDNA -<br>
<a href="http://tools.ietf.org/html/draft-ietf-idnabis-bidi" target="_blank">http://tools.ietf.org/html/draft-ietf-idnabis-bidi</a><br>
* The Unicode code points and IDNA -<br>
<a href="http://tools.ietf.org/html/draft-ietf-idnabis-tables" target="_blank">http://tools.ietf.org/html/draft-ietf-idnabis-tables</a><br>
* Mapping Characters in IDNA -<br>
<a href="http://tools.ietf.org/html/draft-ietf-idnabis-mappings" target="_blank">http://tools.ietf.org/html/draft-ietf-idnabis-mappings</a><br>
<br>
<br>
<br>
Mark<br></div><div>
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</div></blockquote>
<br>
<br>
</blockquote></div><br>