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https://issues.apache.org/jira/browse/JENA-1377?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elie Roux reopened JENA-1377:
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After a [long thread](https://github.com/json-ld/json-ld.org/issues/533) on the
JSON-LD bug tracker, I'm quite convinced that the RDF 1.1 spec is really blur
but allows two modes (because of the MAY in the first sentence you quoted:
1. first mode: all language tags are internally converted to lower case
(positive case of the MAY), and literal term equality is based on this internal
lower case value (so if jena has "foo"@EN and "foo"@en as inputs, it will find
that the two are term equals.
2. second mode: language tags are not internally converted to lower case, and
"foo"@EN and "foo"@en are never term equals.
I think this could be a general Jena option. Do you think that would be
possible?
> Model.isIsomorphicWith() returns false when language tags case do not match
> ---------------------------------------------------------------------------
>
> Key: JENA-1377
> URL: https://issues.apache.org/jira/browse/JENA-1377
> Project: Apache Jena
> Issue Type: Bug
> Components: Core
> Affects Versions: Jena 3.3.0
> Environment: Linux
> Reporter: Elie Roux
>
> Model.isIsomorphicWith() treats language tags in a case-sensitive way, which
> is against BCP47 spec. It is easily shown with an example:
> {noformat}
> Model m1 = ModelFactory.createDefaultModel();
> Resource r = m1.getResource("http://example.com/resource";);
> Property p = m1.getProperty("http://example.com/property";);
> m1.add(r, p, m1.createLiteral("example", "zh-Latn-pinyin")); //
> canonical
> Model m2 = ModelFactory.createDefaultModel();
> r = m2.getResource("http://example.com/resource";);
> p = m2.getProperty("http://example.com/property";);
> m2.add(r, p, m1.createLiteral("example", "zh-latn-pinyin")); //
> lower case
> System.out.println(m1.isIsomorphicWith(m2));
> {noformat}
> prints false, while it clearly should print true. Related bug (which is not
> really a bug per se, just a trigger for this one:
> https://github.com/jsonld-java/jsonld-java/issues/199
> See also https://issues.apache.org/jira/browse/COMMONSRDF-51 for some
> consideration of the language tag case.
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