SPARQL endpoint

[Iker Huerga]

Hi, 

I saw the SPARQL endpoint is now served by a Fuseki server instead of a Virtuoso as it was in the past and I'm having a very trivial problem trying to query it. Apparently the Fuseki server is expecting the graph to be queried as an input either in the 'Target Graph' text box or in a FROM statement inside the query, otherwise it won't know where to retrieve the data from.

In this context, is there a list of the currently available graphs? I tried with SELECT DISTINCT ?g WHERE{GRAPH ?g {?s ?p ?o}} but doesn't work...... or what is the URI for the default graph? I tried 'default' and doesn't work either.....

Thanks in advance!

Best

Iker

P.S: can I ask why did you decide to use Fuseki instead of Virtuoso?

[Stephen Larson]

Hi Iker,

  Fuseki sits on top of Jena which had a more complete implementation of SPARQL 1.1 (property paths, specifically) at the time we made the switch.  That bit of SPARQL 1.1 is particularly useful to us for the kinds of queries we like to do.

  Note the part of the NeuroLex SPARQL endpoint instructions that says "You will need to go to "control panel" and select /ds before you will be able to issue a SPARQL 1.1 query."  Once you do you should see the following screen.  I've put in a query that works to test.  We haven't put in any more graphs than just the default, so we don't often reference the graph explicitly in our queries.

Hope that helps,

  Stephen   

  

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