RE: comments on draft-dracinschi-opes-callout-requirements-00

Hi,
I am a little confused as to what is the difference between these two phrases:

> * Section 3.2.3 - I *think* this should read "An intermediary MAY keep a
> local copy..." -> "An intermediary MAY be required to keep a local copy..."
Dont "MAY keep" and "MAY be required to keep" imply the same thing given the 
implication of MAY (RFC 2119)?

Please clarify.

Regards,
-Srinivas