query: PREFIX schema: <http://schema.org/>
  
  SELECT ?p ?pLabel ?makerLabel ?article WHERE {
    ?p wdt:P195 wd:Q2780100.
    ?p wdt:P170 ?maker 
    OPTIONAL {
      ?article schema:about ?maker.
      ?article schema:inLanguage "nl".
      FILTER((SUBSTR(STR(?article), 1, 25)) = "https://nl.wikipedia.org/")
    }
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
  }