terms of rfc2045

Hello,

I got the following from RFC2045 which isn't fully clear to me:


This single Content-Transfer-Encoding token actually provides two
pieces of information. It specifies what sort of encoding
transformation the body was subjected to and hence what decoding
operation must be used to restore it to its original form, and it
specifies what the domain of the result is.


What is meant with "omain of the result"? (see also below)


Three transformations are currently defined: identity, the "quoted-
printable" encoding, and the "base64" encoding. The domains are
"binary", "8bit" and "7bit".


What does identity mean in this context?

Best regards,

Oliver

Re: terms of rfc2045

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Content-Type: text/plain; format=flowed; charset="US-ASCII"
Content-Disposition: inline
Content-Transfer-Encoding: 7bit

Oliver Block writes:

> Hello,
>
> I got the following from RFC2045 which isn't fully clear to me:
>
>
> This single Content-Transfer-Encoding token actually provides two
> pieces of information. It specifies what sort of encoding
> transformation the body was subjected to and hence what decoding
> operation must be used to restore it to its original form, and it
> specifies what the domain of the result is.
>
>
> What is meant with "omain of the result"? (see also below)

Nothing useful. All it means that if it's "7bit", you know that the result
contains 7bit characters only.

Again, nothing very interesting, or useful.

>
> Three transformations are currently defined: identity, the "quoted-
> printable" encoding, and the "base64" encoding. The domains are
> "binary", "8bit" and "7bit".
>
>
> What does identity mean in this context?

Again, nothing interesting. Basically, it means no transformation
whatsoever. See the 4th paragraph in this section.


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