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classsparql

SPARQL Query - get top-level classes of a dataset

How can I get only the top-level classes of a dataset? The query below returns also the sub-classes (of the top level classes) which I do not need:

SELECT DISTINCT ?class 
WHERE {
?s a ?class .
}
Solution

  • You can filter out any classes that have a subClassOf predicate, e.g.

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