On 10/05/13 13:13, Cekov, Luchesar wrote:
> Hi there,
Hi,
> 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.
>
> 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.
Your store is configured so that the default graph is a union of all the
named graphs, rather than a distinct graph in itself. For queries that's
fine, but for update operations you need to be specific about where the
data is stored.* So try:
DELETE { GRAPH ?g { <http://s/1> ?p ?o } } WHERE { GRAPH ?g {
<http://s/1> ?p ?o } }
instead, which remembers where the triple was found.
Damian
* What you want could be made to work, I think. You've just bumped into
the limits of the current illusion.
