Could I use the "Convert string to RDF" to construct the query in SPARQLMotion
to achieve the same outcome as your jena suggestion?
On Apr 21, 2010, at 5:49 PM, Holger Knublauch wrote:
> Yes with Jena this is possible. Basically you would need to create the SPARQL
> query string dynamically, and insert the URI of the target graph before
> compiling it into a Query object.
>
> But since the ARQ parser won't allow variables as named graphs, we do not
> support this in SPIN yet.
>
> Holger
>
>
> On Apr 22, 2010, at 8:44 AM, Arthur Keen wrote:
>
>> Holger,
>>
>> I was inspired to look at named graphs by a paper by Jeremy Carol's on using
>> named graphs (instead of statement reification) for provenance (published
>> around 2003), in which he shows how one could insert the statements
>> resulting from a particular decision into a named graph and assert the
>> rationale (provenance) for the decision as statements about the named graph,
>> so that the provenance for a series of decisions (statements and rationale)
>> could be captured in a series of named graphs.
>>
>> When I tried to do this in SPARQL, I found that I could not construct an
>> INSERT INTO for an arbitrary graph, which would be created at the decision
>> point. So I thought I could leverage SPIN Template functionality to create
>> graph-specific SPARQL INSERT INTO <graph> queries, but from your email, I
>> understand that that won't work either. These kinds of things are probably
>> easy to do inside Jena.
>>
>> Arthur
>>
>> On Apr 19, 2010, at 3:43 PM, Holger Knublauch wrote:
>>
>>> Hi Arthur,
>>>
>>> I guess the underlying issue is that SPARQL has no formal notion of
>>> pre-bound variables. In SPIN templates (and many other real-world
>>> applications), those pre-bound variables are very convenient and powerful,
>>> but without this concept, having a variable as graph URI does not make
>>> sense, because the SPARQL queries would not be self-contained.
>>>
>>> I have no plans to move SPIN beyond what ARQ (Jena's SPARQL engine) is able
>>> to parse as this would have a lot of undesired implications. Maybe a future
>>> SPARQL version adds a proper concept for pre-bound variables. I will try to
>>> follow up on this topic elsewhere, but in the meantime I am not aware of
>>> work-arounds for your use case.
>>>
>>> Thanks,
>>> Holger
>>>
>>>
>>> On Apr 20, 2010, at 2:47 AM, Arthur Keen wrote:
>>>
>>>> The SPARQL form: INSERT INTO <graph> does not allow a variable for the
>>>> graph so something like INSERT INTO ?graph{...} WHERE GRAPH ?graph{...}
>>>> is not valid SPARQL.
>>>> I tried to get around this constraint by parametrizing the query in a spin
>>>> template so that I could create valid queries from the template by passing
>>>> in a parameter sp:arg1 for the graph into the template, e.g., INSERT INTO
>>>> ?arg1{...} WHERE..., but the syntax checker on the SPIN Template will not
>>>> let it through. Is this the way to do this or is there some other way?
>>>>
>>>> Arthur
>>>>
>>>>
>>>>
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>>>
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>>
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>
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> TopBraid Live, TopBraid Ensemble, SPARQLMotion and SPIN.
> To post to this group, send email to
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