Hi Jason,
Passing a Virtuoso Sponger pragma directive in you query to force the
invocation of the sponger RDF extraction services to extract data from the
graph URI should work as indicated below:
SQL> sparql select count(*) from <http://purl.oclc.org/NET/ssnx/ssn> where { ?s
?p ?o. };
callret-0
INTEGER
_______________________________________________________________________________
0
1 Rows. -- 178 msec.
SQL> sparql DEFINE input:grab-all "yes" select count(*) from
<http://purl.oclc.org/NET/ssnx/ssn> where { ?s ?p ?o. };
callret-0
VARCHAR
_______________________________________________________________________________
767
1 Rows. -- 2073 msec.
SQL>
Then the data is in the Virtuoso Quad Store and can be queried directly/locally:
SQL> sparql select count(*) from <http://purl.oclc.org/NET/ssnx/ssn> where { ?s
?p ?o. };
callret-0
INTEGER
_______________________________________________________________________________
767
1 Rows. -- 167 msec.
SQL>
See the following link for more information on the sponger directives and
Virtuoso Sponger service, which not requires the installation of the Virtuoso
cartridges VAD:
http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtSpongerLinkedDataHooksIntoSPARQL
http://virtuoso.openlinksw.com/dataspace/doc/dav/wiki/Main/VirtSponger
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
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On 20 Jan 2014, at 16:15, Joshua TAYLOR <joshuaaa...@gmail.com> wrote:
> I'm not much of a Virtuoso user, but I do see that there's a similar
> URL that might work better. What happens if you use the following
> (note the .owl at the end)?
>
> from <http://www.w3.org/2005/Incubator/ssn/ssnx/ssn.owl>
>
> On Mon, Jan 20, 2014 at 6:19 AM, Jason Mai <trash...@gmail.com> wrote:
>> Dear all,
>>
>> I'd like to know if it's possible to do sparql query from a rdf dataset as
>> described in
>> http://www.w3.org/TR/rdf-sparql-query/#specDataset
>>
>> I tried it in open-sourced openlink virtuoso sparql endpoint with this
>> query:
>>
>> select *
>> from <http://purl.oclc.org/NET/ssnx/ssn>
>> where {
>> ?s ?p ?o.
>> }
>>
>> The result came out empty.
>> I tried and can get correct result from Jena-based endpoint, however I'd
>> like to do it with virtuoso for most our data are stored there.
>> Could somebody please help me?
>>
>> Bests,
>> Mai
>>
>> ------------------------------------------------------------------------------
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>
>
>
> --
> Joshua Taylor, http://www.cs.rpi.edu/~tayloj/
>
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