Re: [Semediawiki-user] SMW 1.6.1 RDF/SPARQL storage with Sesame

[Jeen B. <jee...@wu...>]

Sorry if I'm overly pushy here, but I thought I'd post a reminder about 
this as I'd really like to sort this problem out.

I am rather keen to get Sesame and SMW to play nice together, and I can 
put a bit of a testing/debugging effort into this. Where do I start 
and/or who do I talk to? :)

Cheers,

Jeen


On 21/10/11 14:23, Jeen Broekstra wrote:
> I've just set up a clean new Semantic Mediawiki (1.6.1) and am trying to
> get it to work with a Sesame (2.6.0) RDF database, using SPARQL query
> and update.
>
> However, I've hit an issue which I'm not sure how to solve: for some
> reason SMW will not add any data to the Sesame store.
> My configuration for the RDF storage is as follows:
>
> $smwgDefaultStore = 'SMWSparqlStore';
> $smwgSparqlQueryEndpoint =
> 'http://localhost:8080/openrdf-sesame/repositories/testwiki';  #
> location of query service
> $smwgSparqlUpdateEndpoint =
> 'http://localhost:8080/openrdf-sesame/repositories/testwiki/statements';
> # location of update service
>
> I've not specified a SparqlDataEndpoint, since Sesame does not implement
> the graph update protocol yet.
>
> I have added a simple test page called TestSMW with a property
> 'testProperty' with value 'dummypage'. This shows up fine in the wiki,
> but for some reason the data does not get added to the Sesame store
> (even when running data repair/upgrade).
>
> I have have checked the logs of my Sesame server, and it shows entries
> like these:
>
> [DEBUG] 2011-10-21 14:16:42,668 [http-8080-4] update="PREFIX wiki:
> <http://wallace/testwiki/index.php/Special:URIResolver/>
> PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
> PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
> PREFIX owl:<http://www.w3.org/2002/07/owl#>
> PREFIX swivt:<http://semantic-mediawiki.org/swivt/1.0#>
> PREFIX property:
> <http://wallace/testwiki/index.php/Special:URIResolver/Property-3A>
> PREFIX xsd:<http://www.w3.org/2001/XMLSchema#>
> DELETE { property:Testproperty ?p ?o } WHERE { property:Testproperty ?p
> ?o }"
> [INFO ] 2011-10-21 14:16:42,668 [repositories/testwiki] POST SPARQL
> update request to repository
> [DEBUG] 2011-10-21 14:16:42,668 [repositories/testwiki] update="PREFIX
> wiki:<http://wallace/testwiki/index.php/Special:URIResolver/>
> PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
> PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
> PREFIX owl:<http://www.w3.org/2002/07/owl#>
> PREFIX swivt:<http://semantic-mediawiki.org/swivt/1.0#>
> PREFIX property:
> <http://wallace/testwiki/index.php/Special:URIResolver/Property-3A>
> PREFIX xsd:<http://www.w3.org/2001/XMLSchema#>
> DELETE { property:Testproperty ?p ?o } WHERE { property:Testproperty ?p ?o }
>
> This shows that SMW does indeed send SPARQL update requests, and that
> Sesame receives them and executes them. However, the strange thing is
> that I only see DELETE requests in the logs. There are no INSERT
> operations at all, so (obviously) no data ever gets added to the store.
>
> Anybody have any idea what's going wrong here?
>
> Cheers,
>
> Jeen
>


-- 
Dr. Jeen Broekstra
Intelligent Systems group
Wageningen UR - Food&  Biobased Research