Scott,
That works! I tried this out, by coupling a "Bind By Select" to a "Perform
Update" but have a question on how "PerformUpdate" figures out it can use
?updateQuery instead of the sml:updateQuery property? When I first tried this,
I tried to bind {?updateQuery} to sml:updateQuery, but that did not work, and
on re-reading your email, I realized that you had simply told me to pass a
string query bound to ?updateQuery to "Perform Update". Does this only work
for "perform update" or are there other modules where you can bind to a value
to a variable that is named the same as a property on a downstream module?
Regards
Arthur
FYI: I used the "Bind by select" SMS module to bind the query:
SELECT ?updateQuery
WHERE {
LET (?updateQuery := "INSERT INTO <http://tb-session> { :Aron rdf:type
owl:Thing } WHERE {}") .
}
Then connected it to a "Perform Update" SMS module
Run the script
Arthur
On Apr 26, 2010, at 11:08 AM, Scott Henninger wrote:
> Arthur; You can pass a string bound to ?updateQuery to a
> PerformUpdate module. Of course, you will need to make sure that the
> query is correct syntactically, including any bindings at run-time.
>
> -- Scott
>
> On Apr 21, 6:05 pm, Arthur Keen <[email protected]> wrote:
>> Holger,
>>
>> Thanks very much for clarifying this.
>>
>> Arthur
>>
>> On Apr 21, 2010, at 5:59 PM, Holger Knublauch wrote:
>>
>>
>>
>>> I would not recommend going down this route. Theoretically it might be
>>> enough to insert the missing triple into the SPIN expression tree, but I
>>> don't think this would be a clean and maintainable solution. It goes too
>>> far into the area of metaprogramming, even for my taste.
>>
>>> Holger
>>
>>> On Apr 22, 2010, at 8:55 AM, Arthur Keen wrote:
>>
>>>> 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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