protected function _createNewSignNode($name, $value = NULL)
{
$doc = $this->sigNode->ownerDocument;
if (!is_null($value)) {
$node = $doc->createElementNS(self::XMLDSIGNS, 'ds:' . $name, $value);
} else {
$node = $doc->createElementNS(self::XMLDSIGNS, 'ds:' . $name);
}
return $node;
}