/**
  * @return null
  */
 protected function unserializeSemanticData($data, &$semanticData)
 {
     $property = null;
     if (!isset($data['data'])) {
         return;
     }
     foreach ($data['data'] as $values) {
         if (is_array($values)) {
             foreach ($values as $key => $value) {
                 /**
                  * @var DIProperty $property
                  */
                 if ($key === 'property') {
                     $property = DIProperty::doUnserialize($value);
                 }
                 /**
                  * @var DataItem
                  */
                 if ($key === 'dataitem') {
                     foreach ($value as $val) {
                         $this->unserializeDataItem($property, $data, $val, $semanticData);
                     }
                 }
             }
         }
     }
 }