/**
  * @param string[] $subItemData
  *
  * @return null|string[]
  */
 protected function createChildAndParseNextLine($subItemData)
 {
     $child = new self($this->lines, $this->inContentLanguage, $subItemData);
     $child->setMenuItemFormatter($this->getMenuItemFormatter());
     $child->setItemListFormatter($this->getItemListFormatter());
     $subItemData = $child->parseLines();
     $this->children[] = $child;
     return $subItemData;
 }