"html": "If and only if the <a href=\"https://w3c.github.io/rdf-concepts/spec/#dfn-datatype-iri\" class=\"internalDFN\" data-link-type=\"dfn\" id=\"ref-for-dfn-datatype-iri-2\">datatype <abbr title=\"Internationalized Resource Identifier\">IRI</abbr></a> is\n <code>http://www.w3.org/1999/02/22-rdf-syntax-ns#langString</code> or\n <code>http://www.w3.org/1999/02/22-rdf-syntax-ns#dirLangString</code>, there is a\n non-empty <dfn class=\"export\" data-export=\"\" data-plurals=\"language tags\" id=\"dfn-language-tag\" tabindex=\"0\" aria-haspopup=\"dialog\" data-dfn-type=\"dfn\">language tag</dfn> as defined by [<cite><a class=\"bibref\" data-link-type=\"biblio\" href=\"https://w3c.github.io/rdf-concepts/spec/#bib-bcp47\" title=\"Tags for Identifying Languages\">BCP47</a></cite>].\n The language tag <em class=\"rfc2119\">MUST</em> be well-formed according to\n <a data-cite=\"bcp47#section-2.2.9\" href=\"https://www.rfc-editor.org/rfc/rfc5646#section-2.2.9\" id=\"ref-for-index-term-section-2-2-9-1\">section 2.2.9</a>\n of [<cite><a class=\"bibref\" data-link-type=\"biblio\" href=\"https://w3c.github.io/rdf-concepts/spec/#bib-bcp47\" title=\"Tags for Identifying Languages\">BCP47</a></cite>],\n and <em class=\"rfc2119\">MUST</em> be treated accordingly, that is, in a case-insensitive manner.\n Two [<cite><a class=\"bibref\" data-link-type=\"biblio\" href=\"https://w3c.github.io/rdf-concepts/spec/#bib-bcp47\" title=\"Tags for Identifying Languages\">BCP47</a></cite>]-complying strings that differ only by case represent the same <a data-link-type=\"dfn|abstract-op\" href=\"https://w3c.github.io/rdf-concepts/spec/#dfn-language-tag\" class=\"internalDFN\" id=\"ref-for-dfn-language-tag-1\">language tag</a>."
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