query: PREFIX skos:<http://www.w3.org/2004/02/skos/core#>
  SELECT ?item ?kamp ?labelwo2 
    WITH {
      SELECT ?kamp ?labelwo2 WHERE {
        SERVICE <https://data.niod.nl/PoolParty/sparql/WO2_Thesaurus> {
      SELECT ?kamp ?labelwo2 WHERE {
        ?kamp skos:topConceptOf <https://data.niod.nl/WO2_Thesaurus/kampen/3650> .
        ?kamp skos:prefLabel ?labelwo2 .
        FILTER(LANG(?labelwo2)='nl') .
      } LIMIT 5000
    }
    } } AS %wo2
  WITH {
    SELECT ?item ?kamp {
      ?item wdt:P2888 ?kamp .
      FILTER(REGEX(STR(?kamp), "https://data.niod.nl/WO2_Thesaurus/kampen/.+")) .
      }
    } AS %wikidata
  WHERE {
    INCLUDE %wo2.
    INCLUDE %wikidata
  }