ESS-00 Receipt Requests

I think we have a situation with our current receipt request
syntax that leads to a bit of extra complexity.  Here's the
issue:

Suppose a message creator does not request a signed receipt.
Using the current syntax there are two ways to indicate this
desire:

1. Do not include a receiptRequest attribute, or
2. Add a receiptRequest attribute, setting the value
of receiptsFrom->allOrNone to noReceipt.

In the MSP world we don't have the luxury of option number
1, so we used the noReceipt value to indicate that a receipt
isn't requested.  I don't think we need to support a noReceipt
value in S/MIME to indicate that a receipt isn't requested
because option #1 provides a clearer and easier to process
mechanism.

Having made that argument, I propose that we alter the ESS
syntax as follows:

ReceiptsFrom ::= CHOICE {
  allOrFirstTier  [0] AllOrFirstTier, -- formerly "allOrNone [0]AllOrNone",
  receiptList     [1] SEQUENCE OF GeneralNames }

AllOrFirstTier ::= INTEGER { -- Formerly AllOrNone
-- Remove noReceipt and move the other values up by one.
  allReceipts          (0),
  firstTierRecipients  (1) }

Thoughts?

----->
Scott Hollenbeck (mailto: hollenbe(_at_)east(_dot_)xsis(_dot_)xerox(_dot_)com)
Xerox Special Information Systems
Arlington, Virginia, USA