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<p>I guess one could always define one's own set of "tag characters"
in the PUA and use them exactly as suggested for the regular tag
characters (or any other way, for that matter.) Use of PUA
characters between consenting adults is nothing Unicode is
concerned with, right? Does that make it a "higher-level
protocol"? Don't know, don't entirely care. If users agree to
treat data a certain way, that's sort of the definition of a
protocol, and even plain text is a protocol by that reasoning.</p>
<p>~mark<br>
</p>
<div class="moz-cite-prefix">On 5/7/24 14:42, Asmus Freytag via
Unicode wrote:<br>
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<blockquote type="cite"
cite="mid:d9146fc4-6af4-4d56-92c4-e8d86fbb57d6@ix.netcom.com">
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<div class="moz-cite-prefix">On 5/7/2024 11:16 AM, Erik Carvalhal
Miller via Unicode wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAJTfRPG0hqCSMLVnkC02tGQcM76UhoHruNpq=AxV_kauRoGw8Q@mail.gmail.com">“The
current conformant use of the undeprecated 96 tag characters is
specified in Unicode Technical Standard #51, ‘Unicode Emoji.’
See ED-14a. emoji tag sequence (ETS) and Annex C, Valid Emoji
Tag Sequences in that specification.” No, the Standard itself
(book or collection) does not define what emoji tag sequences
are or which ones are valid; but that same Standard points to
UTS #51 as the definitive specification of ETSs for “conformant
use” of tag characters. </blockquote>
<p><font face="Candara">Contrary to your reading, the correct
interpretation of that passage is one that considers the tag
characters as quasi reserved for use with a specific external
protocol. The word "current" allows Unicode to later designate
other protocols, if desired.<br>
</font></p>
<p><font face="Candara">It very clearly does not contemplate any
other uses of tag characters, so no, their use with PUA
characters (or any other characters) is not conformant in the
same way as assigning a PUA code point a private character.</font></p>
<p><font face="Candara">In order to use the tag characters
conformantly, you must claim conformance to both TUS and
UTS#51.<br>
</font></p>
<p><font face="Candara">A./<br>
</font></p>
</blockquote>
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