var_dump /eurovoc /concepts/3687
object(Concept)#8280 (1) {
  ["_c":protected]=>
  array(6) {
    ["inScheme"]=>
    array(2) {
      [0]=>
      int(100141)
      [1]=>
      int(100243)
    }
    ["prefLabel"]=>
    object(MLString)#8281 (1) {
      ["_c":protected]=>
      array(2) {
        ["en"]=>
        array(1) {
          [0]=>
          string(28) "underwater mineral resources"
        }
        ["fr"]=>
        array(1) {
          [0]=>
          string(31) "ressource minérale sous-marine"
        }
      }
    }
    ["altLabel"]=>
    object(MLString)#8282 (1) {
      ["_c":protected]=>
      array(2) {
        ["en"]=>
        array(4) {
          [0]=>
          string(16) "marine granulate"
          [1]=>
          string(21) "mining of the sea-bed"
          [2]=>
          string(11) "phosphorite"
          [3]=>
          string(19) "polymetallic nodule"
        }
        ["fr"]=>
        array(5) {
          [0]=>
          string(14) "granulat marin"
          [1]=>
          string(22) "nodule polymétallique"
          [2]=>
          string(11) "phosphorite"
          [3]=>
          string(15) "placer d'étain"
          [4]=>
          string(17) "sulfure des rides"
        }
      }
    }
    ["broader"]=>
    array(1) {
      [0]=>
      int(3549)
    }
    ["related"]=>
    array(3) {
      [0]=>
      int(1061)
      [1]=>
      int(3137)
      [2]=>
      int(2821)
    }
    ["notation"]=>
    array(1) {
      [0]=>
      int(3687)
    }
  }
}