Problems with SPARQL in RapidMiner 6.2

[Juan José González]

Hello, I'm trying to use SPARQL endpoint connection with RapidMiner 6.2 and always appears the next error:

To create SPARQL Endpoint Connection I follow this step:

Tools -> Managed Connections -> And the next screen:

For test I create a SPARQL Data Importer in the MainProcess. Select SPARQL Connection to Eurostat and for the SPARQL query I put the example (copy /paste from from this forum):

select distinct ?power ?radiation ?date

where {

?obs <http://purl.oclc.org/NET/ssnx/ssn#observedBy> <http://www.optimus-smartcity.eu/resource/sant_cugat/sensingdevice/sunnyportal_energy_production>;
 <http://purl.oclc.org/NET/ssnx/ssn#observationResult> [<http://purl.oclc.org/NET/ssnx/ssn#hasValue> ?power];
     <http://purl.oclc.org/NET/ssnx/ssn#observationResultTime> [<http://www.w3.org/2006/time#inXSDDateTime> ?datetime].

BIND (str(?datetime) as ?date)

}

This is my first touch with RapidMiner. Thanks in advance

[Heiko Paulheim]

Hi Juan José,

the problem here is that DBpedia is down for maintenance at the moment, which causes the error.

As it seems you want to use another endpoint (DBpedia is just the default option when you create a new endpoint), you have to change it from http://dbpedia.org/sparql to the desired endpoint in the "Manage Connection" dialog.

Best regards,
Heiko

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[Juan José González]

Hi Heiko. I lot of thanks for quick response. Two more question.

Where can I see the diferent endpoint available?

In RapidMiner 6.2. How can import the workflow like "Using_Linked_Open_Data_from_Eurostat_as_Background_Knowledge-v2" from http://www.myexperiment.org/workflows/3761.html?

I install myexperiment plugin and try with Import and with Open.

Thanks in advance.

Best regard from Tarifa.

[Heiko Paulheim]

Hi Juan José,

actually, using "Open" in the myexperiment plugin is the right way to import it, although I haven't tested it with RM6.

A list of public endpoints is available, e.g., here:
http://linkeddatacatalog.dws.informatik.uni-mannheim.de/dataset?res_format=api%2Fsparql

Best,
Heiko

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[Juan José González]

Hi.

I don't know how to Open a workflow (ie Using_Linked_Open_Data_from_Eurostat_as_Background_Knowledge-v2.txt) in RapidMiner. I try first with RM 6.2 and after with RM 5.3. I install in both the myexperiment (Community Extesion 5.3.0).

How can I do that?

Thanks

El lunes, 9 de febrero de 2015, 20:57:53 (UTC+1), Juan José González escribió:

Hello, I'm trying to use SPARQL endpoint connection with RapidMiner 6.2 and always appears the next error:

To create SPARQL Endpoint Connection I follow this step:

Tools -> Managed Connections -> And the next screen:

...

[Petar Ristoski]

Hi Juan,

Here is a nice video explaining step by step how to import a workflow from myexperiment directly into RapiMiner (the import starts at 2:50): https://www.youtube.com/watch?v=Ws5EbyeJ_VU

Regards,

Petar

[Juan José González]

ok. Now I see MyExperiment Browser. Thanks

El lunes, 9 de febrero de 2015, 20:57:53 (UTC+1), Juan José González escribió:

Hello, I'm trying to use SPARQL endpoint connection with RapidMiner 6.2 and always appears the next error:

To create SPARQL Endpoint Connection I follow this step:

Tools -> Managed Connections -> And the next screen:

...

[Juan José González]

Ok. Nice and easy video. A lot of thanks.

El lunes, 9 de febrero de 2015, 20:57:53 (UTC+1), Juan José González escribió:

Hello, I'm trying to use SPARQL endpoint connection with RapidMiner 6.2 and always appears the next error:

To create SPARQL Endpoint Connection I follow this step:

Tools -> Managed Connections -> And the next screen:

...

[poojaba...@gmail.com]

when i write query for dbpedia in rapid miner i get this error what should i do this query run in dbpedia sparql endpoint perfectly but not run in rapid minerwhat s
houd i do?

[Petar Ristoski]

Hi,

Could you please post the query and the error?

Cheers,

Petar