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Do not normalize language tags in D-interpretations #96

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Do not normalize language tags in D-interpretations #96

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11 changes: 8 additions & 3 deletions spec/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -882,11 +882,11 @@ <h2>D-interpretations</h2>
<tbody>
<tr><td class="semantictable">If <code>rdf:langString</code> is in D,
then for every language-tagged string E with lexical form sss and language tag ttt,
IL(E)= &lt; sss, ttt' &gt;, where ttt' is ttt converted to lower case using US-ASCII rules</td></tr>
IL(E)= &lt; sss, ttt &gt;</td></tr>
<tr><td class="semantictable">If <code>rdf:dirLangString</code> is in D,
then for every directional language-tagged string E with lexical form sss,
language tag ttt, and base direction bbb,
IL(E)= &lt; sss, ttt', bbb &gt;, where ttt' is ttt converted to lower case using US-ASCII rules</td></tr>
IL(E)= &lt; sss, ttt, bbb &gt;</td></tr>
<tr><td class="semantictable">For every other IRI aaa in D,
I(aaa) is the datatype identified by aaa, and for every literal
"sss"^^aaa, IL("sss"^^aaa) = L2V(I(aaa))(sss)</td></tr>
Expand Down Expand Up @@ -2281,7 +2281,12 @@ <h2>Acknowledgments</h2>
<h2>Substantive changes since RDF 1.1</h2>

<ul>
<li> RDF entailment rule <a>rdfD1a</a> was added in RDF 1.2.
<li>In D-interpretations, language tags are no longer converted to lowercase.
This is because the RDF 1.2 abstract syntax ignores the case of [[BCP47]] strings (unlike RDF 1.1).
In other words, `"chat"@fr` and `"chat"@FR` now have the <em>same</em> language tag in the abstract syntax,
and therefore it is not necessary to normalize them in the interpretation.
</li>
<li>RDF entailment rule <a>rdfD1a</a> was added in RDF 1.2.
This rule should have been included in RDF 1.1 when the two built-in
datatypes (<code>xsd:string</code> and <code>rdf:langString</code>)
were added to RDF entailment.
Expand Down
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