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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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Andy Seaborne resolved JENA-1377.
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Resolution: Not A Problem
> 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: Wish
> Components: ARQ, Core
> Affects Versions: Jena 3.3.0
> Environment: Linux
> Reporter: Elie Roux
> Priority: Minor
>
> 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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