/**
  * {@inheritdoc}
  */
 public function getValue()
 {
     if ($this->hasReference()) {
         return $this->reference_item->getValue();
     } else {
         return parent::getValue();
     }
 }
 /**
  * {@inheritdoc}
  */
 public function __construct(Page $parent, array $format)
 {
     parent::__construct($parent, $format);
     $this->style = new BasicStyle($format);
 }