Github user ansell commented on a diff in the pull request: https://github.com/apache/commons-rdf/pull/30#discussion_r96309778 --- Diff: api/src/test/java/org/apache/commons/rdf/api/AbstractRDFTest.java --- @@ -194,6 +194,114 @@ public void testCreateLiteralLangISO693_3() throws Exception { assertEquals("\"Herbert Van de Sompel\"@vls", vls.ntriplesString()); } + public void testCreateLiteralLangCaseInsensitive() throws Exception { + // COMMONSRDF-51: Literal langtag may not be in lowercase, but + // must be COMPARED (aka .equals and .hashCode()) in lowercase + // as the language space is lower case. + final Literal lower = factory.createLiteral("Hello", "en-gb"); + final Literal upper = factory.createLiteral("Hello", "EN-GB"); + final Literal mixed = factory.createLiteral("Hello", "en-GB"); + + + assertEquals("en-gb", lower.getLanguageTag().get()); --- End diff -- RDF4J may not follow this in some cases. It may use the BCP47 normalisation conventions to obtain en-GB instead.
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