query: SELECT ?item ?itemLabel ?value ?valueLabel 
  #sample variables defined below (but commented out)
  ?dob ?dod ?country
  WHERE
  {
  	?item wdt:P7831 ?value .
  	?item wdt:P106 wd:Q674426 . 
  #	OPTIONAL {?item wdt:P570 ?dod } . 
  #	?item wdt:P17 ?country . 
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "nl,en"  }    
  }