Comments on conneg-content-feature-01

I read the draft, and there is some point I don't understand.

- sect. 3.1.2: which is the reason, then, to have Content-features in the 
main header lines, like in example 4.3? Is it just to warn the receiver
that there is something which is text/html with limited colors and 
something which is text/html in black and white?
I would found it more logical if the features indicated in the main
header have to be applied to all the parts of the message, like in the 
fax example in 4.2. It could be also nice to have a pseudofeature
with the name of the relevant part: this is not really important
for a multipart message, but in the case of a file whose type is
application/zip you can choose to uncompress (inflate, or whatever) 
only the files you can render.

- sect. 5: Maybe an example could be added to explain the last sentence:
who knows, knowing that the file is text/html tells the attacker that 
there is a lot of "<" and ">" chars.

I have no other comments:the draft seems really fine.

ciao, .mau.