Stream properties for JSON can indicate mediaContentType but ATOM doesn't allow it

JSON format permits stream properties to optionally indicate content-type (as well as mediaEtag). So the receiver can determine the media content type without having to actually GET the stream content.

ATOM format, on the other hand, does not permit the media content type to appear in an "atom:link". (See ATOM section 9.1 in CS02).

It seems that this must be an accidental omission, as surely we should expect equivalent information about the stream content to be available regardless of the format (JSON or ATOM).