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> On Aug 22, 2015, at 1:37 AM, Nauman Ramzan <[email protected]> wrote:
>
> Hi Mark
> Did you connect virtuoso with fuseki or you just import data into fuseki ?
>
>
>> On Aug 22, 2015, at 2:56 AM, Mark Feblowitz <[email protected]>
>> wrote:
>>
>> This seems like it should be a FAQ, but I’m not finding anything useful.
>>
>> I’m using SPARQL to explore linked data, which includes discovering
>> predicates. My understanding was that I could bind a subject and use
>> variables for predicate and object.
>>
>> It’s important to note that what I’m experiencing is when using dbpedia,
>> which is built on Virtuoso - perhaps my question should be posted elsewhere?
>> But I am doing this via a Fuseki endpoint, so there’s at least some
>> relevance :-?
>>
>> Here’s what I’m trying to do:
>>
>> I have some queries to a Fuseki endpoint that call out to dbpedia using
>> SERVICE blocks. Before entering the service I bind a value for ?Player, and
>> then with the service I pose the query;
>>
>>> PREFIX do: <http://dbpedia.org/ontology/>
>> ...
>>> {SELECT DISTINCT * where {
>>> ?Player a do:BasketballPlayer.
>>> ?Player ?r ?A.
>>> ?Player2 ?r ?A }
>>
>> I expected to find a binding for ?r as do:team. And when I pre-bind ?r to
>> that, I see plenty of bindings for ?A and ?Player2. The one binding that I
>> do see when leaving ?r unbound is
>>
>>> http://www.w3.org/1999/02/22-rdf-syntax-ns#type
>>
>> (I notice that dbpedia virtuso is limited - it cannot handle a BIND
>> statement.)
>>
>> Is the case am I seeing universal behavior or behavior specific to virtuoso?
>> Either way, are there clever workarounds?
>>
>> I do know that I can “white-list in” some bindings for ?r, using a VALUES
>> statement. But that pretty much defeats the discovery purpose. Also, as this
>> is varied and often schema-less content, I can’t rely on an ontology as a
>> guide to defined predicates.
>>
>> Any suggestions?
>>
>> Thanks,
>>
>> Mark
>>
