Hi there,
I started using Jena TDB and Fuseki just recently and I am trying to post some
Sparql Update Delete statements.
I am experiencing a problem when deleting with no explicit graph specified.
DELETE { <http://s/1> ?p ?o } WHERE { <http://s/1> ?p ?o .}
The above will not delete any statements that have been inserted in a specific
graph. For example:
If I insert some statements with:
INSERT DATA {
GRAPH <http://test/uri> {
<http://s/1> <http://p/3> <http://o/3> .
<http://s/1> <http://p/2> <http://o/2> .
<http://s/1> <http://p/1> <http://o/1> .
}
};
And then try to delete them with
DELETE {<http://s/1> ?p ?o } WHERE { <http://s/1> ?p ?o .}
Nothing is deleted.
If I delete them with:
WITH <http://test/uri>
DELETE { <http://s/1> ?prop ?obj } WHERE {<http://s/1> ?prop ?obj}
The statements get really deleted!
According to Sparql 1.1 Update spec [1] the default graph should be used if
there is no graph explicitly specified in the update query which I reason means
that the statements above should be deleted even if a GRAPH is not explicitly
specified. Furthermore if I query with no explicit graph specified like:
select * where {<http://s/1> ?p ?q}
I get all the statements from above.
Can you please confirm if this is a bug? Perhaps I am not doing something
properly?
I did my experiments on both Fuseki 0.2.5 and 0.2.6 with the same result. On
0.2.6 I used the update web UI and on 0.2.5 I used a http client to make http
request staring to my Dataset's Sparql Update endpoint. In both cases the
result is the same. I can provide an automated test if needed.
Many thanks,
Luchesar
[1] http://www.w3.org/TR/sparql11-update/#deleteInsert
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