/**
* Checks if node matches css query filter ":only-of-type"
* @return bool
* @see match()
* @access private
*/
protected function filter_onlytype()
{
if ($this->parent === null) {
return false;
} else {
return count($this->parent->getChildrenByTag($this->tag, 'total', false)) === 1;
}
}
