the valid content of TXT RR

[Doug]

2011/4/21 Mark Andrews <marka at isc.org>:
>
> In message <BANLkTik=rV4NH7NOO5+rDEGP6Yet4NxN6g at mail.gmail.com>, Doug writes:
>> Hello,
>>
>> what characters can or can't be included in a TXT record for DNS?
>>
>> Thanks.
>
> Named supports 8 bit data using the same presentation encoding as domain
> names.
>


Thanks mark.
But I meant what text string is permitted or not permitted in a TXT record.

Regards.