How to extract DBPedia categories through DBPedia Spotlight?

Question

I'm trying to extract the types and their respective levels from an entity named through DBPediaSpotlight. I already looked in forums, the documentation of the git hub and found nothing. I would like to know one way to do this extraction. Thank you!

Answer 1

Given that your desired root is <http://www.w3.org/2002/07/owl#Thing>, you're actually looking for the rdf:type tree (not Wikipedia Categories, as such).

The typing of <http://dbpedia.org/resource/Semantic_Web> seems a bit odd, so I've used <http://dbpedia.org/resource/Cat> below. You'll note that the data does not always include a tree of the sort you wish.

This will get explicit rdf:type statements --

SELECT ?type
 WHERE
   { <http://dbpedia.org/resource/Cat> a ?type
   }

-- and this will climb to the top of any rdf:type trees --

SELECT ?type
 WHERE
   { <http://dbpedia.org/resource/Cat> a+ ?type
   }

A query to build the full tree would be rather more complex, but is entirely possible.

Answer 2

As mentioned here, you may need this in SPARQL to fetch the categories from DBpedia URI

PREFIX dbr: <http://dbpedia.org/resource/>
SELECT DISTINCT ?subject
  WHERE { dbr:Semantic_Web dct:subject ?subject }
LIMIT 100

which might be retrieved in various serializations. For example in JSON