A. Soroka commented on JENA-1499:

is this actually a bug? I was (perhaps wrongly) under the impression that this 
is perfectly correct behavior. From 
{quote}Some [RDF dataset|https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-dataset] 
implementations do not track empty [named 
graphs|https://www.w3.org/TR/rdf11-concepts/#dfn-named-graph]. Applications can 
avoid interoperability issues by not ascribing importance to the presence or 
absence of empty named graphs.
That having been said, if we want to make a guarantee across Jena datasets (or 
if we already do and I just didn't know) of course we can make it so.

> 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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