[jira] [Created] (CLEREZZA-951) Language of RDF Literals is case sensitive

["Rupert Westenthaler (JIRA)" <ji...@apache.org>]

Rupert Westenthaler created CLEREZZA-951:
--------------------------------------------

             Summary: 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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