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https://issues.apache.org/jira/browse/JENA-1001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14646485#comment-14646485
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Marvin Frommhold edited comment on JENA-1001 at 7/29/15 5:46 PM:
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As expected:
{code}
s,p,o,g
urn:subject1,http://www.w3.org/2000/01/rdf-schema#label,subject1,http://example.org/graph1
urn:subject2,http://www.w3.org/2000/01/rdf-schema#label,subject2,http://example.org/graph2
{code}
The thing is, your query does not define an RDF Dataset so the default one of
the service is used.
But my issue is related to the fact, that a query defines its own dataset to be
queried which must override the one of the service:
{quote}
If a query provides such a dataset description, then it is used in place of any
dataset that the query service would use if no dataset description is provided
in a query.
{quote}
was (Author: depressiverobot):
As expected:
{code}
s,p,o,g
urn:subject1,http://www.w3.org/2000/01/rdf-schema#label,subject1,http://example.org/graph1
urn:subject2,http://www.w3.org/2000/01/rdf-schema#label,subject2,http://example.org/graph2
{code}
The thing is, the query does not define an RDF Dataset so the default one of
the service is used.
But my issue is related to the fact, that the query defines its own dataset to
be queried which must override the one of the service:
{quote}
If a query provides such a dataset description, then it is used in place of any
dataset that the query service would use if no dataset description is provided
in a query.
{quote}
> 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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