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<p class="MsoNormal"><span lang="EN-US">In ISO 639, historic language varieties that are linguistically different enough from their modern derivatives to be considered distinct languages are handled in exactly that way: as distinct languages. In several cases,
 multiple distinct historic stages of a language may be coded as distinct languages. For example,
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span></span><![endif]><span dir="LTR"></span><span lang="EN-US">“Old Tibetan” (otb) is used for Tibetan of the 7<sup>th</sup> to 10<sup>th</sup> centuries AD; “Classical Tibetan” (xct) is used for Tibetan of the 10<sup>th</sup> to 12<sup>th</sup> centuries.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span></span><![endif]><span dir="LTR"></span><span lang="EN-US">“Old Korean” (oko) is used for Korean of the 3<sup>rd</sup> to 9<sup>th</sup> centuries AD; “Middle Korean” (okm) is used for Korean of the 10<sup>th</sup> to 16<sup>th</sup> centuries.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If anyone comes to this list asking for variant subtags for varieties such as “Classical X”, “Ancient X”, “Old X”, “Middle X”, etc., then the question should be asked whether the variant in question should be considered
 a distinct, historic language. If so, then they should request a language ID in ISO 639-3, not a variant subtag.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Peter<o:p></o:p></span></p>
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