query: # position-mandates
  
  SELECT DISTINCT ?ordinal ?item ?start_date ?start_precision ?end_date ?end_precision ?prev ?next ?nature
  WHERE {
    ?item wdt:P31 wd:Q5 ; p:P39 ?posn .
    ?posn ps:P39 wd:Q74218859 .
    FILTER NOT EXISTS { ?posn wikibase:rank wikibase:DeprecatedRank }
  
    OPTIONAL { ?posn pqv:P580 [ wikibase:timeValue ?start_date; wikibase:timePrecision ?start_precision ] }
    OPTIONAL { ?posn pqv:P582 [ wikibase:timeValue ?end_date; wikibase:timePrecision ?end_precision ] }
    OPTIONAL { ?posn pq:P1365|pq:P155 ?prev }
    OPTIONAL { ?posn pq:P1366|pq:P156 ?next }
    OPTIONAL { ?posn pq:P1545 ?ordinal }
    OPTIONAL { ?posn pq:P5102 ?nature }
  }
  ORDER BY DESC(?start_date) ?item
  