[calsify] RFC7986 and EMAIL parameter

[Michael Douglass <[e-mail]>]

I wonder if Cyrus could help clarify a couple of issues.

The text says:

  Description:  This property parameter MAY be specified on "ORGANIZER"
       or "ATTENDEE" properties.  This property can be used in situations
       where the calendar user address value of the "ORGANIZER" and
       "ATTENDEE" properties is not likely to be an identifier that
       recipients of scheduling messages could use to match the calendar
       user with, for example, an address book entry.  The value of this
       property is an email address that can easily be matched by
       recipients.  Recipients can also use this value as an alternative
       means of contacting the calendar user via email.  If a recipient's
       calendar user agent allows the recipient to save contact
       information based on the "ORGANIZER" or "ATTENDEE" properties,
       those calendar user agents SHOULD use any "EMAIL" property
       parameter value for the email address of the contact over any
       mailto: calendar user address specified as the value of the
       property.  Calendar user agents SHOULD NOT include an "EMAIL"
       property parameter when its value matches the calendar user
       address specified as the value of the property.

So

question 1:

Is it the case that the value - the calendar address is still the 
identifier for the attendee?

Question 2:

is it legal to send a REPLY back with a different EMAIL value - e.g. 
attendee decides they want to use a different email address?

Question 3:

Does "Recipients can also use this value as an alternative means of 
contacting the calendar user via email." include sending iMip messages?

Question 4: (already past a 'couple')

5546 says:

    When used to provide a delegation response,
    the "Delegator" SHOULD include the calendar address of the "Delegate"
    on the "DELEGATED-TO" property parameter of the "Delegator's"
    "ATTENDEE" property.  The "Delegate" SHOULD include the calendar
    address of the "Delegator" on the "DELEGATED-FROM" property parameter
    of the "Delegate's" "ATTENDEE" property.

So that implies that the DELEGATED-TO value might also be a non mailto 
URI? 7986 says nothing about these parameters

I assume that we could have something like:

ATTENDEE;CN=Michael 
Douglass;PARTSTAT=ACCEPTED;ROLE=CHAIR;EMAIL=[e-mail] 
<mailto:[e-mail]>:/sadlksdfkkljklkjjklljkkjjLKJLKJjLKjJKLKLjJKLLkjKjLkjLKJ/principal/

ATTENDEE;CN=Another Michael 
Douglass;PARTSTAT=ACCEPTED;DELEGATED-TO="/sadlksdfkkljklkjjklljkkjjLKJLKJjLKjJKLKLjJKLLkjKjLkjLKJ/principal/";EMAIL=[e-mail] 
<mailto:[e-mail]>:/aMzkzNTI4MzkzNTI4MzkzNQPuXCcDTdG5iXfOhcljjCSqMYrUXDcs6f1z7CyXejTR/principal/