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<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Source separation for round-trip compatibility was a principle applied circa 1990 for compatibility with widely-used standards at that time.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Today, source separation is not a sufficient criterion for encoding distinctions in other legacy character sets. It can be provided as part of the evidence in a proposal, but other
evidence would be required as for any new character proposal, in particular that a text element cannot be adequately represented using any existing character sequences and that there is a significant user community requiring public, plain-text interchange.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Peter<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Sławomir Osipiuk <sosipiuk@gmail.com>
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<b>Sent:</b> February 3, 2025 10:36 AM<br>
<b>To:</b> Peter Constable <pgcon6@msn.com>; Peter Constable via Unicode <unicode@corp.unicode.org>; piotrunio-2004@wp.pl; James Kass <jameskass@code2001.com><br>
<b>Subject:</b> Re: Unicode fundamental character identity<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">On Monday, 03 February 2025, 12:19:06 (-05:00), Peter Constable via Unicode wrote:<o:p></o:p></p>
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<p class="MsoNormal">As stated previously, Unicode makes no guarantee of supporting source separation / round-trip compatibility with HP264x.<o:p></o:p></p>
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<p class="MsoNormal">I'm honestly surprised by this. I always thought (because it was repeated so many times - must remember repetition does not equal truth) that round-trip compatibility with old character sets was a founding cornerstone of Unicode and so
contrastive use (aka source separation) in an old charset would be persuasive evidence for inclusion.<o:p></o:p></p>
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