Serial number indicating the state of the current card range cache.
def get_serial_number() -> str: ... def set_serial_number(value: str) -> None: ...
serial_number = property(get_serial_number, set_serial_number)
If this element is present when submitting a Card Range Request (CRReq) with the request_card_ranges method, the Directory Server returns card ranges that have been updated since the time of the response which returned this serial number. If the element is not present, the Directory Server returns all participating card ranges. This field is updated with a new serial number after each call to request_card_ranges.