Stian Soiland-Reyes created COMMONSRDF-55:
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             Summary: Stream of Jena quads use wrong IRI for default graph
                 Key: COMMONSRDF-55
                 URL: https://issues.apache.org/jira/browse/COMMONSRDF-55
             Project: Apache Commons RDF
          Issue Type: Bug
          Components: jena
    Affects Versions: 0.3.0
            Reporter: Stian Soiland-Reyes
             Fix For: 1.0.0


See https://travis-ci.org/apache/commons-rdf/builds/195548479

{code}
org.apache.commons.rdf.jena.DatasetJenaTest
streamLanguageTagsCaseInsensitive(org.apache.commons.rdf.jena.DatasetJenaTest)  
Time elapsed: 0.012 sec  <<< FAILURE!
java.lang.AssertionError: expected:<<http://example.com/s1> 
<http://example.com/greeting> "Hello"@EN-GB <urn:x-arq:DefaultGraph>.> but 
was:<<http://example.com/s1> <http://example.com/greeting> "Hello"@en-GB .>
{code}

Jena uses the IRI `<urn:x-arq:DefaultGraph>` internally to represent the 
default graph within datasets - we need to recognize that on the way out of a 
`JenaDatasetImpl.stream()` and possibly in the `asQuad(JenaQuad)` converter and 
replace it with `Optional.empty()` so the default graph appears the same across 
implementations.

The `AbstractDatasetTest`  should be augmented to do more tests on the default 
graph, including `.stream()`, `.iterate()`, `.contains()` and `.remove()`1.



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