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Re: [core] MULTIPART-CT: A few editorial comments

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 23 August 2019 10:53 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Thomas Fossati <Thomas.Fossati@arm.com>, "core@ietf.org" <core@ietf.org>
Thread-Topic: [core] MULTIPART-CT: A few editorial comments
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Date: Fri, 23 Aug 2019 10:53:40 +0000
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Subject: Re: [core] MULTIPART-CT: A few editorial comments
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Hi,

>>  To me, "message" would refer to a CoAP request or response :)
>    
>    My two cents:
>    
>    application/multipart-core is a "normal" MIME media type, and it's not
>    bound to CoAP by any means (although CoAP is the motivating use case).
  
Agree.

>    In the context of MIME (RFC 2046) "message body" is the established
>    wording for the MIME message content, irrespective of the transport
>    protocol (CoAP, SMTP, HTTP).
  
Agree. 

>    This is how I interpret it, at least.  And I agree with you that the current
>    text is ambiguous in this respect.
  
We need to define how the generic terms above are mapped into CoAP.

For example, if you transport a "message body" in CoAP, what is the part of the CoAP message where the "message body" is conveyed?

Figure 7 of RFC 7252 defines the "Payload" part of a CoAP message. I assume that is the part used to convey a "message body" associated with a MIME media type.

But, MULTIPART-CT does not talk about the Payload part. It talks about "body", which is nowhere defined for CoAP. I need to know what part of a CoAP message the "body" is.

Regards,

Christer

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