/**
* set private data referenced by $key to $value and generate the xml for ocs
* @param string $format
* @param string $app
* @param string $key
* @param string $value
* @return string xml/json
*/
private static function privateDataSet($format, $app, $key, $value)
{
$user = OC_OCS::checkpassword();
if (OC_OCS::setData($user, $app, $key, $value)) {
echo OC_OCS::generatexml($format, 'ok', 100, '');
}
}