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https://issues.apache.org/jira/browse/JENA-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388508#comment-16388508
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Andy Seaborne commented on JENA-1499:
-------------------------------------

It's not a bug but it is inconsistent. This does not print anything.

{noformat}
DatasetGraph dsg = DatasetGraphFactory.createTxnMem();
UpdateAction.parseExecute("CREATE GRAPH <http://example/g2>", dsg);
Iter.print(dsg.listGraphNodes());
{noformat}

I'd rather the TriG writers didn't have to test each named graph for being 
empty.

{{DatasetGraphFactory.createGeneral()}} is the exception and does have empty 
graphs but also it does print the name in the example.


> The TIM dataset retains a memory of named graphs after deleting all quads.
> --------------------------------------------------------------------------
>
>                 Key: JENA-1499
>                 URL: https://issues.apache.org/jira/browse/JENA-1499
>             Project: Apache Jena
>          Issue Type: Bug
>    Affects Versions: Jena 3.6.0
>            Reporter: Andy Seaborne
>            Priority: Major
>
> Illustration:
> {noformat}
>         DatasetGraph dsg = DatasetGraphFactory.createTxnMem();
>         Quad q = SSE.parseQuad("(:g :s :p :o)");
>         dsg.add(q);
>         dsg.delete(q);
>         Iter.print(dsg.listGraphNodes());
> {noformat}
> prints {{http://example/g}}.



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