How to retrieve articles from dbpedia?

Question

I've recently dived in the world of semantic web. It's been smooth, until now. To the point... I'm trying to get Articles from dbpedia, but I don't get results somehow. For what I have seen in the DBpedia ontology, I think this is supposed to be correct. Article is a "subclass" of WrittenWork, so is Book. I can get books and their info through the rdf triples. When using a SPARQL query that is almost the same as the one for books, I don't get results. This is weird, because I know there are references to articles in Wikipedia.

The query for books:

SELECT DISTINCT ?book
WHERE { ?book a dbo:Book . }

If I substitute dbo:Book for dbo:Article, I get nothing. I'm testing here: http://dbpedia.org/sparql

Can someone point me the right direction?

@scotthenninger it's one of the default prefixes that you can see in dbpedia.org/sparql — Daniel Mendonça
@IvoVelitchkov not in DBpedia, but I found more than one page in wikipedia that I think should be classified as such, and using the query you wrote in your answer I can confirm it has none. — Daniel Mendonça
@DanielMendonça an article should be a topic of a Wikipedia page to be classified as such. And if you have such an example, please share it. — Ivo Velitchkov

Ivo Velitchkov Ivo Velitchkov · Accepted Answer · 2016-05-03T21:28:07

If you test which subslasses of dbo:WrittenWork have no members, using this query

SELECT DISTINCT *
WHERE { 
  ?class rdfs:subClassOf dbo:WrittenWork .
  FILTER NOT EXISTS {?s a ?class }
}

you'll see that dbo:Article is among them.

How to retrieve articles from dbpedia?

1 Answers