public function addReference($name, $node, $type)
{
if (!$node instanceof DOMNode) {
throw new Exception('$node is not of type DOMNode');
}
$curencdoc = $this->encdoc;
$this->_resetTemplate();
$encdoc = $this->encdoc;
$this->encdoc = $curencdoc;
$refuri = XMLSecurityDSig::generateGUID();
$element = $encdoc->documentElement;
$element->setAttribute("Id", $refuri);
$this->references[$name] = array("node" => $node, "type" => $type, "encnode" => $encdoc, "refuri" => $refuri);
}