var_dump /eurovoc /concepts/754
object(Concept)#8959 (1) {
  ["_c":protected]=>
  array(6) {
    ["inScheme"]=>
    array(2) {
      [0]=>
      int(100141)
      [1]=>
      int(100267)
    }
    ["prefLabel"]=>
    object(MLString)#8960 (1) {
      ["_c":protected]=>
      array(2) {
        ["en"]=>
        array(1) {
          [0]=>
          string(16) "renewable energy"
        }
        ["fr"]=>
        array(1) {
          [0]=>
          string(21) "énergie renouvelable"
        }
      }
    }
    ["altLabel"]=>
    object(MLString)#8961 (1) {
      ["_c":protected]=>
      array(2) {
        ["en"]=>
        array(3) {
          [0]=>
          string(20) "non-renewable energy"
          [1]=>
          string(23) "renewable energy source"
          [2]=>
          string(17) "low-carbon energy"
        }
        ["fr"]=>
        array(2) {
          [0]=>
          string(25) "énergie non renouvelable"
          [1]=>
          string(30) "source d'énergie renouvelable"
        }
      }
    }
    ["broader"]=>
    array(1) {
      [0]=>
      int(744)
    }
    ["related"]=>
    array(3) {
      [0]=>
      int(3638)
      [1]=>
      int(3551)
      [2]=>
      int(2945)
    }
    ["notation"]=>
    array(1) {
      [0]=>
      int(754)
    }
  }
}