Is a payload always a representation?

Hi all,

RFC 7231 says:

> 3.3.  Payload Semantics
>
>    Some HTTP messages transfer a complete or partial representation as
>    the message "payload".

Is the converse also true? In other words, is a payload in an HTTP message
always a complete or partial representation?

"3.1.4.1.  Identifying a Representation" defines what an unidentified
payload
is. Is the unidentified payload also a complete or partial representation?

If an unidentified payload is also a representation, it reflects a state of
a
resource. Does the resource have no uri or have one that we don't know?

Best regards,
EungJun