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prefix o:   
prefix cal: 
@bind kg:values
construct  { 
  ?x o:birthDate ?date ; rdfs:label ?l
} 
where {

  bind (st:get(st:uri) as ?uri)
  bind (st:set(st:year, xsd:integer(substr(?uri, strlen(st:) + 2))) as ?y)

  bind (xsd:date(concat(?y, "-", 1, "-", 1,   "+02:00")) as ?start)
  bind (xsd:date(concat(?y, "-", 12, "-", 31, "+02:00")) as ?end)

  service  { 
    select ?x ?d ?start ?end ?l where {  
          values (?start ?end) { (UNDEF UNDEF) }
          ?x o:birthDate ?d  
          filter (datatype(?d) = xsd:date)         
          filter (?d >= ?start && ?d <= ?end) 
          ?x rdfs:label ?l
          filter langMatches(lang(?l), "fr")
    } 
  }
  
  bind (cal:date(year(?d), month(?d), day(?d)) as ?date)
}