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https://issues.apache.org/jira/browse/JENA-1377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16099644#comment-16099644
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Elie Roux commented on JENA-1377:
---------------------------------
About the graph: I still don't manage to get it working, I've asked a [question
on
stackoverflow](https://stackoverflow.com/questions/45296772/jena-creating-model-from-file-with-rdfparser-results-in-nosuchmethoderror-org-a)
as it's not really related to this bug report.
About the RDF norm, thank you for your explanation, it's a bit more clear now,
although I still find it really puzzling. Once I'll manage to canonicalize
literals when I import a graph, I guess I can just not care about that aspect
anymore, especially since it's pretty clear I have no leverage whatsoever on
the RDF norm.
> 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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