[jira] [Commented] (JENA-1499) The TIM dataset retains a memory of named graphs after deleting all quads.

["A. Soroka (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JENA-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16388495#comment-16388495 ] 

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 [https://www.w3.org/TR/rdf11-concepts/#section-dataset]:
{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.
{quote}
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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