add missing value encodings

            b_value = base64.b64decode(b_b64_value, validate=True)

            value = b_value.decode('UTF-8')

            return json.loads(value)

    elif encoding == 'uint_val':

        return value.uint_val

    elif encoding == 'int_val':

        return value.int_val

    elif encoding == 'string_val':

        return value.string_val

    elif encoding == 'bool_val':

        return value.bool_val

    elif encoding == 'bytes_val':

        return value.bytes_val

    elif encoding == 'float_val':

        return value.float_val

    elif encoding == 'double_val':

        return value.double_val

    elif encoding == 'decimal_val':

        return value.decimal_val

    elif encoding == 'leaflist_val':

        return [decode_value(item) for item in value.leaflist_val.element]

    else:

        MSG = 'Unsupported Encoding({:s}) in Value({:s})'

        # pylint: disable=broad-exception-raised