query: #title: Missing date of death
  # Complex constraint from [[Property talk:P1808]]
  # Person born before 1916 with no date of death
  SELECT DISTINCT ?item
  WHERE 
  {
  	?item wdt:P1808 ?senat;
  		wdt:P31 wd:Q5;
  		wdt:P569 ?date .
  
  	FILTER (?date < "1916-01-01T00:00:00Z"^^xsd:dateTime)
  	OPTIONAL {?item wdt:P570 ?d } .
  	FILTER (!bound(?d))
  }