Hi Carl-Uno and Tom,
Yes - I support moving the 'ippget:' (in-band IPP
notifications) proposal forward as a RECOMMENDED
I believe, after we have more implementation and
interop testing experience, we ultimately WILL be
able to decide on one (or two?) IPP notification
delivery methods that are REQUIRED for all IPP
Printers that support notifications. But that
time is in the future.
- Ira McDonald, consulting architect at Xerox and Sharp
High North Inc
PS - I've just read this latest draft and will send
some mostly minor comments at some point on the list.
From: Manros, Carl-Uno B [mailto:cmanros at cp10.es.xerox.com]
Sent: Wednesday, September 20, 2000 11:42 AM
To: Hastings, Tom N; ipp (E-mail)
Subject: RE: IPP> NOT - Updated 'ipp-get' Delivery Method for Event
Notifi cation po sted
We have been going backwards and forwards on how many delivery methods we
For all those out there who were not attending the PWG meeting I would like
get a feeling for your reaction to have one more RECOMMENDED delivery method
and for that matter about having a third delivery method at all.
It should be said that the people in the meeting all seemed to like the new
method, which should also be relatively easy to implement.
In the special meeting on QUALDOCS, now renamed IPP FAX, the 'ippget'
seemed to be the best fit for that project, if indeed notifications
will be included, which isn't yet clear from the discussions.
I would like to hear from more people on the DL about this 3rd delivery
method, and in particular whether you support this to go out for an IPP WG
Principal Engineer - Xerox Architecture Center - Xerox Corporation
701 S. Aviation Blvd., El Segundo, CA, M/S: ESAE-231
Phone +1-310-333 8273, Fax +1-310-333 5514
Email: manros at cp10.es.xerox.com
From: Hastings, Tom N [mailto:hastings at cp10.es.xerox.com]
Sent: Wednesday, September 20, 2000 9:37 AM
To: ipp (E-mail)
Subject: IPP> NOT - Updated 'ipp-get' Delivery Method for Event
Notification po sted
This was renamed from 'ipp-getw' at the meeting last week to 'ipp-get' and
agreed to be the third RECOMMEND delivery method for IPP Notification. This
method is a synthesis of Harry's server directed polling method and the
earlier 'ipp-get' polling method. We also agreed at the meeting that for
the moment we are not pursuing any additional Event Notification Delivery
Methods. Send comments to the mailing list and/or discuss at today's
Here is the Abstract:
The notification extension document [ipp-ntfy] defines operations that a
client can perform in order to create Subscription Objects in a Printer and
carry out other operations on them. A Subscription Object represents a
Subscription abstraction. The Subscription Object specifies that when one of
the specified Events occurs, the Printer sends an asynchronous Event
Notification to the specified Notification Recipient via the specified
Delivery Method (i.e., protocol).
The notification extension document [ipp-ntfy] specifies that each Delivery
Method is defined in another document. This document is one such document,
and it specifies the 'ippget' delivery method.
The 'ippget' Delivery Method is a 'pull and push' Delivery Method. That is,
the Printer saves Event Notification for a period of time and expects the
Notification Recipient to fetch the Event Notifications (the pull part). The
Printer continues to send Event Notifications to the Notification Recipient
as Events occur (the push part) if the client has selected the option to
wait for additional Event Notifications.
When a Printer supports this Delivery Method, it holds each Event
Notification for an amount of time, called the Event Notification Lease
When a Notification Recipient wants to receive Event Notifications, it
performs an IPP operation called 'Get-Notifications', which this document
defines. This operation causes the Printer to return all Event Notifications
held for the Notification Recipient. If the Notification Recipient has
selected the option to wait for additional Event Notifications, the Printer
continues sending Event Notifications to the Notification Recipient as
additional Events occur.
The -rev is diffed with the old file name ipp-poll which had the older
'ipp-get' method. The files are available at: