* Store a data item to an external store, identified by a partial URL
* The protocol part is used to identify the class, the rest is passed to the
* class itself as a parameter.
- * @return string The URL of the stored data item, or false on error
+ * @param $url
+ * @param $data
+ * @param $params array
+ * @return string|false The URL of the stored data item, or false on error
*/
static function insert( $url, $data, $params = array() ) {
list( $proto, $params ) = explode( '://', $url, 2 );