Update named set of DNS name servers.

        :type value: str
        :param value: (Optional) new title

        :raises: ValueError for invalid value types.

def name_server_set(self, value):
        """Update named set of DNS name servers.

        :type value: str
        :param value: (Optional) new title

        :raises: ValueError for invalid value types.
        """
        if not isinstance(value, six.string_types) and value is not None:
            raise ValueError("Pass a string, or None")
        self._properties["nameServerSet"] = value