Gregory Williams wrote:
> I ran into some strange results from the DBPedia SPARQL endpoint and was
> directed here. This query:
>
> SELECT * WHERE { ?s a ?o }
>
> when run against the default dataset[1] returns several results that only
> have one variable binding (for ?o), instead of the expected two. In the
> results I'm seeing, two erroneous results appear directly after one with ?s=<
> http://nasa.dataincubator.org/spacecraft/1968-089A.json>. Both of these
> erroneous results have ?o=foaf:Document. Is this a known problem? Might I
> expect this problem to be fixed in the DBPedia endpoint anytime soon?
>
>
> I also just noticed that (again on the default dataset) the of this query
>
> DESCRIBE <http://www.cs.umd.edu/~hendler/>
>
> doesn't include the single RDF triple in which that URI appears as the
> subject (rdf:type foaf:Document). Obviously this is more of an expectations
> issue than an actual error, but it struck me as odd. Is this the expected
> behavior of DESCRIBE in Virtuoso? Is the algorithm used for DESCRIBE
> described anywhere?
>
>
> thanks,
> gregory williams
>
> [1]
> http://dbpedia.org/sparql?default-graph-uri=&query=select+*+where+%7B+%3Fs+a+%3Fo+%7D
>
>
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Gregory,
While we look into the DBpedia instance, please repeat your query
against the LOD Cloud Cache instance at: http://lod.openlinksw.com/sparql .
The LOD Cloud cache instance has all the DBpedia data plus all the data
we can get our hands on from the Linked Open Data Cloud (total 17
Billion+ records).
--
Regards,
Kingsley Idehen
President & CEO
OpenLink Software
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen
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