[jira] [Commented] (JENA-1001) named graphs set not empty if no FROM NAMED clause given

["Andy Seaborne (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JENA-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14646104#comment-14646104 ] 

Andy Seaborne commented on JENA-1001:
-------------------------------------

Which storage sub-system are you using?

> named graphs set not empty if no FROM NAMED clause given
> --------------------------------------------------------
>
>                 Key: JENA-1001
>                 URL: https://issues.apache.org/jira/browse/JENA-1001
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: Fuseki
>    Affects Versions: Fuseki 2.0.0
>            Reporter: Marvin Frommhold
>
> According to the [SPARQL 1.1 Query Language specification|http://www.w3.org/TR/2013/REC-sparql11-query-20130321/] the set of named graphs must be empty if a query only specifies FROM clauses and no FROM NAMED clauses:
> bq. An RDF Dataset comprises ... zero or more named graphs
> That means, the only way to express zero named graphs is to specify no FROM NAMED clause.
> *But:*
> Having the following data:
> http://example.org/graph1
> {code}
> <urn:subject1> rdfs:label "Subject one" .
> {code}
> http://example.org/graph2
> {code}
> <urn:subject2> rdfs:label "Subject two" .
> {code}
> and executing the query:
> {code}
> SELECT ?g
> FROM <http://example.org/graph1>
> WHERE {
>   GRAPH ?g { ?s ?p ?o . }
> }
> {code}
> will return
> {code}
>  ?g
> ===========
>  ex:graph1
>  ex:graph2
> {code}
> which proves that the set of named graphs is not empty:
> {quote}
> GRAPH can ... use a variable which will range over the IRI of all the named graphs in the query's RDF dataset.
> {quote}



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