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https://issues.apache.org/jira/browse/CLEREZZA-951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14490911#comment-14490911
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Reto Gmür commented on CLEREZZA-951:
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Fixed in rdf-core
> Language of RDF Literals is case sensitive
> ------------------------------------------
>
> Key: CLEREZZA-951
> URL: https://issues.apache.org/jira/browse/CLEREZZA-951
> Project: Clerezza
> Issue Type: Bug
> Components: rdf.core
> Reporter: Rupert Westenthaler
>
> Based on the RDF specification (3.3 Literals [1]) BCP47 (Tags for Identifying
> Languages) have to be used as language values for RDF literals.
> Section 2.1.1 of BCP47 [2] clearly states
> {code}
> At all times, language tags and their subtags, including private use
> and extensions, are to be treated as case insensitive: there exist
> conventions for the capitalization of some of the subtags, but these
> MUST NOT be taken to carry meaning.
> {code}
> In Clerezza the following assertions fails
> {code}
> Literal l1 = new PlainLiteralImpl("test", new Language("EN"));
> Literal l2 = new PlainLiteralImpl("test", new Language("en"));
> Assert.assertEquals(l1, l2);
> {code}
> The same is true for the more likely case
> {code}
> Literal l1 = new PlainLiteralImpl("test", new Language("en-us"));
> Literal l2 = new PlainLiteralImpl("test", new Language("en-US"));
> Assert.assertEquals(l1, l2);
> {code}
> [1] http://www.w3.org/TR/rdf11-concepts/#section-Graph-Literal
> [2] http://tools.ietf.org/html/bcp47#section-2.1.1
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