/**
 * Method to handle the `<contributor>` element for the feed.
 *
 * @param   Feed               $feed  The Feed object being built from the parsed feed.
 * @param   \SimpleXMLElement  $el    The current XML element object to handle.
 *
 * @return  void
 *
 * @since   3.1.4
 */
protected function handleContributor(Feed $feed, \SimpleXMLElement $el)
{
    $feed->addContributor($this->inputFilter->clean((string) $el->name, 'html'), filter_var((string) $el->email, FILTER_VALIDATE_EMAIL), filter_var((string) $el->uri, FILTER_VALIDATE_URL));
}