[JENA-1377] Model.isIsomorphicWith() returns false when language tags case do not match

• Type: Wish
• Status: Closed
• Priority: Minor
• Resolution: Not A Problem
• Affects Version/s: Jena 3.3.0
• Component/s: ARQ, Core

Environment

Linux

• Assignee: Unassigned
• Reporter: Elie Roux
• Created: 24/Jul/17 14:23
• Updated: 14/Nov/17 16:33
• Resolved: 23/Aug/17 10:12

Description

Model.isIsomorphicWith() treats language tags in a case-sensitive way, which is against BCP47 spec. It is easily shown with an example:

           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));

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.