Question

For some reason, this very simple query isn’t working:

 PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
 SELECT ?link
 WHERE { <http://dbpedia.org/resource/Anarchism>
        dbpedia-owl:wikiPageWikiLink ?link }

There’s nothing wrong with the syntax since a similar query involving external links works fine:

 PREFIX dbpedia-owl: <http://dbpedia.org/ontology/>
 SELECT ?link
 WHERE { <http://dbpedia.org/resource/Anarchism>
        dbpedia-owl:wikiPageExternalLink ?link}

I’ve looked on their blog and don’t see anything about discontinuing the wikiPageWikiLink category. So what am I doing wrong here?

Answer 1

As you can see by going to http://dbpedia.org/resource/Anarchism, there is no property called wikiPageWikiLink. So there’s nothing wrong with your query—it just asks for data that’s not there.