[IPP] IPP Everywhere and "The Great Compromise"

[IPP] IPP Everywhere and "The Great Compromise"

[IPP] IPP Everywhere and "The Great Compromise"

Murdock, Joe jmurdock at sharplabs.com
Thu Aug 23 22:12:39 UTC 2012


I agree with the proposed changes device supports DNS-SD and WS-Discovery and JPEG and PNG-Raster.

From: ipp-bounces at pwg.org [mailto:ipp-bounces at pwg.org] On Behalf Of Michael Sweet
Sent: Thursday, August 23, 2012 7:02 AM
To: ipp at pwg.org
Subject: Re: [IPP] IPP Everywhere and "The Great Compromise"

After letting this sink in over the past couple days, I have to pull my support for allowing a client to only support JPEG.  Aside from the quality issues, JPEG does not support multiple page content and so does not satisfy the requirements set forth in the IPP Everywhere spec and current charter.  That leaves us with:

1. Discovery:
   a. Printers MUST support both DNS-SD and WS-Discovery (adds WS-Discovery)
   b. Clients MUST support DNS-SD and/or WS-Discovery (Clients can choose amongst the two required protocols)

I humbly suggest that the <1000 lines of code (CUPS' implementation is 830 lines for both read and write) needed to generate PWG Raster is not an undue burden on clients to implement support for and conform to IPP Everywhere.

Please comment, and we will review this at the next IPP conference call on September 10th.


On Aug 20, 2012, at 9:42 PM, Michael Sweet <msweet at apple.com<mailto:msweet at apple.com>> wrote:


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


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_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair


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