CODEWITHSUNDEEP
rdfsparqldbpedia
user5232014
user5232014

Reputation:

Meaning of DBPedia SPARQL query that identifies concepts?

I don't understand the output generated by the following SPARQL query:

select distinct ?Concept
where {
    <http://dbpedia.org/resource/Blink-182> a ?Concept
}
LIMIT 100

Can someone please explain me what does "concepts" mean in DBPedia, and what is the meaning of the result of this query? Does it has any connection with rdf:type?

Upvotes: 1

Views: 708

Answers (1)

O. R. Mapper
O. R. Mapper

Reputation: 20770

Does it has any connection with rdf:type?

Yes - in SPARQL, a in a triple pattern is a shortcut for rdf:type, or, more precisely, <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>.

Therefore, the above query returns 100 IRIs that are used as the object in triples whose predicate is rdf:type - so to speak, 100 "types", or "concepts".

The query in your question is

select distinct ?Concept
where {
    <http://dbpedia.org/resource/Blink-182> a ?Concept
}
LIMIT 100

This returns all types of <http://dbpedia.org/resource/Blink-182>, i.e. all IRIs linked to <http://dbpedia.org/resource/Blink-182> with the rdf:type property in the current DBpedia dataset. Concretely, these are:

  • <http://www.w3.org/2002/07/owl#Thing>
  • <http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#Agent>
  • <http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#SocialPerson>
  • <http://www.wikidata.org/entity/Q215380>
  • <http://www.wikidata.org/entity/Q43229>
  • <http://dbpedia.org/ontology/Agent>
  • <http://dbpedia.org/ontology/Band>
  • <http://dbpedia.org/ontology/Group>
  • <http://dbpedia.org/ontology/Organisation>
  • <http://schema.org/MusicGroup>
  • <http://schema.org/Organization>
  • <http://umbel.org/umbel/rc/Band_MusicGroup>
  • <http://umbel.org/umbel/rc/Organization>

Taking the first two results as an example, this means that somewhere in the DBpedia dataset, the triples

S: <http://dbpedia.org/resource/Blink-182>
P: <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
O: <http://www.w3.org/2002/07/owl#Thing>

and

S: <http://dbpedia.org/resource/Blink-182>
P: <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
O: <http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#Agent>

exist. Ditto for the other resulting IRIs.

Upvotes: 6

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