Re: Query on draft-ietf-sip-body-handling-04- Can required multipart/mixed contain required body part

Hi,

> sec 7.2 of draft-ietf-sip-body-handling-04
>  
>       Also per the previous rules, a 'multipart/mixed' body whose
>       handling is required can contain only body parts whose handling is
>       optional.
>  
> I wonder why required multipart/mixed can NOT contain required body part?
> I think it's just same meaning repeated once, should be fine.
>  
> any thoughts?

note that the verb is "can". That is, it is possible that all the body 
parts are optional... but that is not the only possibility. The 
possibility you mention (i.e., a required body part within a required 
multipart/mixed) is also possible. That paragraph you are referring to 
simply points out cases that may be surprising for readers, per earlier 
mailing list discussions, so that they are clearer.

Thanks,

Gonzalo
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