Downloaded DBpedia data does not include all instance-types triples

Question

I downloaded some data from http://downloads.dbpedia.org/2015-04/core/, including: instance-type_en.nt, mappingbased-properties_en.nt, and some others.

I have successfully loaded them into OpenLink Virtuoso DB, but when I run some sample SPARQL query, e.g., a query to see all the triples about a subject Xiamen_University, the problem appears.

select ?s  ?p  ?o
where 
  {
    ?s  rdfs:label  "Xiamen University"@en  . 
    ?s  ?p  ?o  .
  }

From the DBPedia SPARQL endpoint, there are heaps of triples about iamen_University; while in my db, there are only 4 or 5 of them.

Especially, there is no triple in db indicating Xiamen_University is a type of University, or any instance-type triples at all. I found similar cases on some other subjects as well.

I think the instance-types_en.nt file does not include all the instance-types triple from Wikipedia, same problem with mappingbased-properties. Is that right? If so, where could I find the right source file?

Joshua Taylor Joshua Taylor · Accepted Answer · 2016-06-07T12:25:44

There's a whole list of the datasets available at on the downloads page. I don't see lots of documentation about exactly what's in each one of them, but the names are fairly descriptive, and the question mark links next to each one show a preview of what kind of information is in each one of them. Hovering over each title will provide a short description. E.g.:

It looks like to get most of the interesting properties, you'd probably want the mappingbased datasets, along with the labels dataset (since the query that you wrote identifies objects by label).

Downloaded DBpedia data does not include all instance-types triples

1 Answers