/**
* Enter description here...
*
* @param string|PhpQueryObject
* @return PhpQueryObject|QueryTemplatesSource|QueryTemplatesParse|QueryTemplatesSourceQuery
*/
public function add($selector = null)
{
if (!$selector) {
return $this;
}
$stack = array();
$this->elementsBackup = $this->elements;
$found = phpQuery::pq($selector, $this->getDocumentID());
$this->merge($found->elements);
return $this->newInstance();
}
