def get_qualifier_notification_session(self, qualifier_receiver=None, proxy=None):
if proxy is None:<EOL><INDENT>raise NullArgument()<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the notification session for notifications pertaining to qualifier changes.

        arg:    qualifier_receiver
                (osid.authorization.QualifierReceiver): the qualifier
                receiver
        arg:    proxy (osid.proxy.Proxy): a proxy
        return: (osid.authorization.QualifierNotificationSession) - a
                ``QualifierNotificationSession``
        raise:  NullArgument - ``qualifier_receiver`` or ``proxy`` is
                ``null``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_qualifier_notification()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_qualifier_notification()`` is ``true``.*