[IPP] Potential errata/update for PWG Raster Format and/or IPP Everywhere specs

[IPP] Potential errata/update for PWG Raster Format and/or IPP Everywhere specs

[IPP] Potential errata/update for PWG Raster Format and/or IPP Everywhere specs

Ira McDonald blueroofmusic at gmail.com
Wed May 21 15:42:28 UTC 2014


Hi Smith,

We've never made "pdl-override-supported" have 'guaranteed' as REQUIRED
(even in IPP/2.1 or IPP/2.2 levels), because it's binary.

If you claim that your Printer supports 'guaranteed' then you have to be
able to
*successfully* intercept and override everything in your interpreters
(vanishingly
unlikely in PDF, for example).

I agree with Mike that I've never seen a printer in the wild that actually
supported
'guaranteed'.

I also agree that should make 'attempted' a REQUIRED value and 'guaranteed'
a RECOMMENDED value (explaining in the Implementors Guide that there are
practical limitations w/ third-party interpreters to perfect override).

Cheers,
- Ira




Cheers,
- Ira


Ira McDonald (Musician / Software Architect)
Co-Chair - TCG Trusted Mobility Solutions WG
Chair - Linux Foundation Open Printing WG
Secretary - IEEE-ISTO Printer Working Group
Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
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



On Wed, May 21, 2014 at 11:22 AM, Kennedy, Smith (Wireless Architect) <
smith.kennedy at hp.com> wrote:

> Hi Mike,
>
> Since “attempted” is so squishy, why not mandate “guaranteed”?  Including
> “attempted” seems like a loophole.
>
> Smith
>
> /**
>     Smith Kennedy
>     ATB Wireless Architect - PPS
>     Hewlett-Packard Co.
> */
>
>
>
> On 2014-05-21, at 7:42 AM, Michael Sweet <msweet at apple.com> wrote:
>
> > All,
> >
> > It has come to my attention that neither the IPP Everywhere nor the PWG
> Raster Format specs explicitly call out required values for the
> "pdl-override-supported" Printer attribute. This attribute specifies
> whether the Printer can override embedded job ticket information (such as
> media size) when requested in a Job via the "ipp-attribute-fidelity" or
> "job-mandatory-attributes" Job Template attributes.
> >
> > Generally speaking, Printers SHOULD support PDL override for the
> standard PDLs in IPP Everywhere, including PWG Raster, JPEG, and PDF.
>  Typically this means forcing prints to a single media/size or forcing
> simplex/duplex output, and is particularly important for JPEG.
> >
> > My recommendation is for us to add the following conformance statement
> in a future revision of the IPP Everywhere specification:
> >
> >    pdl-override-supported (type2 keyword)
> >
> >    When reporting capabilities for the 'application/pdf', 'image/jpeg',
> or 'image/pwg-raster'
> >    MIME media types, Printers MUST report either 'attempted' or
> 'guaranteed' for the
> >    "pdl-override-supported" Printer attribute,
> >
> > Thoughts?
> >
> > _________________________________________________________
> > Michael Sweet, Senior Printing System Engineer, PWG Chair
> >
> > _______________________________________________
> > ipp mailing list
> > ipp at pwg.org
> > https://www.pwg.org/mailman/listinfo/ipp
>
>
> _______________________________________________
> ipp mailing list
> ipp at pwg.org
> https://www.pwg.org/mailman/listinfo/ipp
>
>
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