var_dump /eurovoc /concepts/4657
object(Concept)#6769 (1) {
  ["_c":protected]=>
  array(6) {
    ["inScheme"]=>
    array(2) {
      [0]=>
      int(100141)
      [1]=>
      int(100239)
    }
    ["prefLabel"]=>
    object(MLString)#6770 (1) {
      ["_c":protected]=>
      array(2) {
        ["en"]=>
        array(1) {
          [0]=>
          string(16) "vehicle on rails"
        }
        ["fr"]=>
        array(1) {
          [0]=>
          string(19) "véhicule sur rails"
        }
      }
    }
    ["altLabel"]=>
    object(MLString)#6771 (1) {
      ["_c":protected]=>
      array(2) {
        ["en"]=>
        array(5) {
          [0]=>
          string(10) "locomotive"
          [1]=>
          string(16) "railway carriage"
          [2]=>
          string(17) "railway equipment"
          [3]=>
          string(5) "train"
          [4]=>
          string(4) "tram"
        }
        ["fr"]=>
        array(5) {
          [0]=>
          string(10) "locomotive"
          [1]=>
          string(21) "matériel ferroviaire"
          [2]=>
          string(5) "train"
          [3]=>
          string(4) "tram"
          [4]=>
          string(5) "wagon"
        }
      }
    }
    ["broader"]=>
    array(1) {
      [0]=>
      int(4514)
    }
    ["related"]=>
    array(1) {
      [0]=>
      int(3089)
    }
    ["notation"]=>
    array(1) {
      [0]=>
      int(4657)
    }
  }
}