Hello Scott, thank you for the very quick response.
> Jan, the WHERE clause of all SPARQL queries is applied to the current data
> graph. CONSTRUCT, INSERT, DELETE, etc. are applied to the results of the
> WHERE clause. Therefore the WHERE clause cannot recursively consider any
> INSERTs/DELETEs to the data.
>
> To query the result of inserting some data, you will need to apply two
> queries: the insert, then the query. So it will be something like the
> following
So I will have to create two queries - one for inserting the triples and then a
second to remove the "duplicates" that are created without the NOT EXISTS.
In the example, the goal is to create the "represents" triple exactly once,
even when a resource is involved in multiple knows relations.
So for the (likely) case ...
Peter knows Tom
Peter knows Mary
I'd like to create ...
_:go1 represents Peter
but not ...
_:go1 represents Peter
_:go2 represents Peter
I think a second query deleting the duplicates will do the job then. Although I
don't quite like the idea of creating triples just to delete them in the next
step.
> (I wasn't really able to understand the intent of your query):
(Go stands for graphic object here. A parallel graph of graphic objects shall
be constructed for the source data.)
Thank you again for clarifying this though it was only a SPARQL-question, as it
seems.
Jan
>
> INSERT
> { #using GRAPH to explicitly state where the data is inserted in highly
> recommended
> _:0 a :GO .
> _:0 :represents ?who .
> }
> WHERE
> { ?who :knows ?whom .
> }
>
> ...then you can query the resulting graph:
>
> SELECT ?who ?whom
> WHERE
> { ?who :knows ?whom .
> NOT EXISTS
> { ?someGO :represents ?who .
> } .
> }
>
> ...which is a strange query because it cannot match anything after the INSERT.
>
>
> --
> Scott Henninger
> Sr, Product & Support Engineer, TopQuadrant, Inc.,
> tel: 402-429-3751 / fax: 703 991-8192 / main: 703 299-9330
> Training:
> Semantic Technology Training and Intro to TopBraid - Sept. 12-15, 2011,
> Washington, DC
> TopBraid Advanced Products Training - Sept. 26-29, 2011, Washington, DC
> TQ Blog: Voyages of the Semantic Enterprise
>
>
>
> On 9/3/11 8:28 AM, Jan Polowinski wrote:
>>
>> I'm trying to construct a graph depending on
>>
>> a) an existing graph +
>> b) the already created part of the new graph.
>>
>> Does the WHERE part of an INSERT statement only consider the graph before
>> starting the INSERT? Or should it consider the newly created triples
>> already? Here is what I tried:
>>
>>
>> # construct a GO for all subjects in knows-relations
>> INSERT {
>> _:0 a :GO .
>> _:0 :represents ?who .
>> }
>> WHERE {
>> ?who :knows ?whom .
>> NOT EXISTS {
>> ?someGO :represents ?who .
>> } .
>> }
>>
>> Although using NOT EXISTS, in the first run, I create more blank nodes than
>> I want to. In additional runs then everything works as expected.
>>
>> I'm happy for any hints. Do I expect too much of SPARQL here? Or am I only
>> missing some setting? I could not explicitly find something about this issue
>> in the SPARQL 1.1 Update specification. Does anybody know an alternative to
>> achieve that the newly created triples are immediately considered in the
>> WHERE clause?
>>
>> Jan
>>
>>
>>
>>
>
>
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--
Dipl. Medien-Inf. Jan Polowinski
Research Assistant
Technische Universität Dresden
Department of Computer Science
Software- and Multimedia-Technology
01062 Dresden
Phone: +49 351 463 38608
Mobil: +49 176 80158257
E-Mail: [email protected]
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