code: public function deserializeJSON($jsonString)
      {
          $data = json_decode($jsonString);
  
          $this->setContent($data->content);
          $this->setContext($data->context);
      }
docs: Updates the element implementing this interface using a JSON representation.
  
  This means updating the state of this object with that defined in the JSON
  as opposed to returning a new instance of this object.
  
  @param string $jsonString Representation of the object.
  
  @return void