query: SELECT ?item ?itemLabel ?itemDescription ?ref ?cc ?coor ?img ?start ?end ?detail
  WHERE
  {
      hint:Query hint:optimizer "None".
      BIND ( wd:Q311 as ?cem ) 
      ?item wdt:P119 ?cem . 
  
      ?item p:P119 ?st . 
      ?st ps:P119 ?cem .
      OPTIONAL { ?st pq:P965 ?ref } 
      OPTIONAL { ?st pq:P373 ?cc } 
      OPTIONAL { ?st pq:P625 ?coor } 
      OPTIONAL { ?item wdt:P1442 ?img }
      OPTIONAL { ?st pq:P580 ?start }  
      OPTIONAL { ?st pq:P582 ?end }  
      OPTIONAL { ?st pq:P805 ?detail }  
      SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en,fr". }
  }