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https://issues.apache.org/jira/browse/JENA-805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne closed JENA-805.
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> Graph#isIsomorphicWith should use semantic equivalence when comparing blank
> nodes
> ---------------------------------------------------------------------------------
>
> Key: JENA-805
> URL: https://issues.apache.org/jira/browse/JENA-805
> Project: Apache Jena
> Issue Type: Bug
> Components: Jena
> Affects Versions: Jena 2.12.1
> Reporter: Chris Beer
> Assignee: Andy Seaborne
> Priority: Minor
> Fix For: Jena 2.12.2
>
>
> It appears that Graph#isIsomorphicWith appears to use syntactic equivalence
> when comparing blank nodes:
> https://github.com/apache/jena/blob/master/jena-core/src/main/java/com/hp/hpl/jena/graph/impl/GraphMatcher.java#L27
> It should probably use semantic equivalence instead, or, at the very least,
> respect the RDF 1.1 equivalence of plain literals and xsd:string-typed
> literals.
> Here is an example that I believe should be considered isomorphic:
> {code}
> @Test
> public void isomorphismShouldRespectPlainLiteralEquivalence() {
> // Without worrying about a blank node, isomorphism works fine:
> Model model1 = ModelFactory.createDefaultModel();
> model1.read(IOUtils.toInputStream("<info:x> <info:y> \"x\""), "",
> "TTL");
> Model model2 = ModelFactory.createDefaultModel();
> model2.read(IOUtils.toInputStream("<info:x> <info:y>
> \"x\"^^<http://www.w3.org/2001/XMLSchema#string>"), "", "TTL");
> assertTrue(model1.isIsomorphicWith(model2)); // WORKS
> // Now with a blank node:
> Model model3 = ModelFactory.createDefaultModel();
> model3.read(IOUtils.toInputStream("<info:x> <info:y> [ <info:z> \"x\"
> ]"), "", "TTL");
> Model model4 = ModelFactory.createDefaultModel();
> model4.read(IOUtils.toInputStream("<info:x> <info:y> [ <info:z>
> \"x\"^^<http://www.w3.org/2001/XMLSchema#string> ]"), "", "TTL");
> assertTrue(model3.isIsomorphicWith(model4)); // BROKEN
> }
> {code}
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