[IPP] IPP Everywhere and "The Great Compromise"

[IPP] IPP Everywhere and "The Great Compromise"

[IPP] IPP Everywhere and "The Great Compromise"

Ira McDonald blueroofmusic at gmail.com
Tue Aug 21 15:42:35 UTC 2012


Hi Glen,

I understand why you want to lower Printer implementation burden,
but your proposal defeats the essence of the "Great Compromise",
which is focused on support of IPP Everywhere by OS vendors (to
achieve what the user thinks is "driver-less printing").

As you say, Printer firmware doesn't change often - but if it once
supports the two document formats and two discovery protocols it
will reliably interoperate w/ all IPP Everywhere Clients in the future.

Cheers,
- Ira


Ira McDonald (Musician / Software Architect)
Chair - Linux Foundation Open Printing WG
Secretary - IEEE-ISTO Printer Working Group
Co-Chair - IEEE-ISTO PWG IPP WG
Co-Chair - TCG Trusted Mobility Solutions WG
Chair - TCG Embedded Systems Hardcopy SG
IETF Designated Expert - IPP & Printer MIB
Blue Roof Music/High North Inc
http://sites.google.com/site/blueroofmusic
http://sites.google.com/site/highnorthinc
mailto:blueroofmusic at gmail.com
Winter  579 Park Place  Saline, MI  48176  734-944-0094
Summer  PO Box 221  Grand Marais, MI 49839  906-494-2434
Temporary Cabin *** 2012 only *** 906-494-2523



On Tue, Aug 21, 2012 at 11:13 AM, Petrie, Glen
<glen.petrie at eitc.epson.com>wrote:

>  Mike (all)****
>
> ** **
>
> The change below pushes the burden to the printer (at an increased cost to
> the printer) while the Client, a software entity, has less burden.  What is
> wrong with ****
>
> ** **
>
> 1. Discovery:****
>
> ** **
>
>    a. Clients MUST support DNS-SD and WS-Discovery ****
>
>    b. Printers MUST support either DNS-SD or WS-Discovery and RECOMMENED
> to support both.****
>
> ** **
>
> 2. Document Formats:****
>
> ** **
>
> **a.       **Clients MUST support both JPEG and PWG Raster ****
>
> **b.      **Printers MUST support either JPEG or PWG Raster and
> RECOMMENDED to support both.****
>
> ** **
>
> This change to the printer requirements could mean a faster time to market
> since printers are already support one of the discoveries and documents
> formats but may not support both discoveries and document formats. ****
>
> ** **
>
> As was discussed in the meeting, if either discovery or document format
> change in the future, the backward compatibility burden would have to be on
> the Client to deal with legacy printers.   There 'may' be an issue of
> Client legacy but I content that is still easier to update Clients rather
> than printer firmware.   In the event of a Cloud Print Service or a Print
> Manager; then, I would assume the "RECOMMEDED" support of both would be
> implemented.  ****
>
> ** **
>
> Glen****
>
> ** **
>
> ** **
>  ------------------------------
>
> *From:* ipp-bounces at pwg.org [mailto:ipp-bounces at pwg.org] *On Behalf Of *Michael
> Sweet
> *Sent:* Monday, August 20, 2012 6:42 PM
>
> *To:* ipp at pwg.org
> *Subject:* [IPP] IPP Everywhere and "The Great Compromise"
> ****
>
>  ** **
>
> All,****
>
> ** **
>
> We discussed the PWG Last Call comments received thus far at today's IPP
> WG conference call.  Two of the comments concerned the client requirements
> to support DNS-SD for discovery and both PWG Raster and JPEG for document
> formats.  After over an hour of spirited debate, the following "great
> compromise" was proposed to resolve the last call comments:****
>
> ** **
>
> 1. Discovery:****
>
> ** **
>
>    a. Printers MUST support both DNS-SD and WS-Discovery (adds
> WS-Discovery)****
>
>    b. Clients MUST support at least one of DNS-SD and WS-Discovery
> (Clients can choose amongst the two required protocols)****
>
> ** **
>
> 2. Document Formats:****
>
> ** **
>
>    a. Printers MUST support both JPEG and PWG Raster (no change)****
>
>    b. Clients MUST support at least one of JPEG and PWG Raster (relaxes
> conformance - previously a Client had to support both)****
>
> ** **
>
> Please comment on the proposed changes.****
>
> ** **
>
> _________________________________________________________
> Michael Sweet, Senior Printing System Engineer, PWG Chair****
>
> ** **
>
>
> --
> This message has been scanned for viruses and
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> believed to be clean. ****
>
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