ebremer opened a new issue, #2854:
URL: https://github.com/apache/jena/issues/2854
### Version
5.2.0
### What happened?
Run the following code
```
Model a = ModelFactory.createDefaultModel();
a.add(ResourceFactory.createResource("https://dummy.com/TripleA";),
RDF.type, OWL.Thing);
Model b = ModelFactory.createDefaultModel();
b.add(ResourceFactory.createResource("https://dummy.com/TripleB";),
RDF.type, OWL.Thing);
Dataset ds = DatasetFactory.create();
ds.setDefaultModel(a);
ds.addNamedModel(ResourceFactory.createProperty("https://dummy.com/ngB";), b);
System.out.println("Graph A
===========================================");
a.write(System.out, "TTL");
System.out.println("Graph B
===========================================");
b.write(System.out, "TTL");
System.out.println("UNION of A and B
===========================================");
ds.getUnionModel().write(System.out, "TTL");
```
outputs
```
Graph A ===========================================
<https://dummy.com/TripleA>
a <http://www.w3.org/2002/07/owl#Thing> .
Graph B ===========================================
<https://dummy.com/TripleB>
a <http://www.w3.org/2002/07/owl#Thing> .
UNION of A and B ===========================================
<https://dummy.com/TripleB>
a <http://www.w3.org/2002/07/owl#Thing> .
```
I thought the union model would include the triples in the default graph as
well.
### Relevant output and stacktrace
_No response_
### Are you interested in making a pull request?
None
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