[IPP] Report on CUPS attribute group ordering restrictions

[IPP] Report on CUPS attribute group ordering restrictions

[IPP] Report on CUPS attribute group ordering restrictions

Ira McDonald blueroofmusic at gmail.com
Mon May 15 23:36:46 UTC 2017


Hi Mike,

Thanks.

AFAIK there will never be a Document attributes group in a System Service
operation?

Having the Resource attributes and then System attributes last in all the
applicable
operations should simplify the edits a bit.

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
Jan-April: 579 Park Place  Saline, MI  48176  734-944-0094
May-Dec: PO Box 221  Grand Marais, MI 49839  906-494-2434


On Mon, May 15, 2017 at 7:29 PM, Michael Sweet <msweet at apple.com> wrote:

> Ira,
>
> The order should match the tag values, so if system-attributes-tag ends up
> as 0x0a (next open slot) then it needs to come after all other attribute
> groups (at the end).
>
> FWIW, the resource-attributes-tag value will be 0x08 (from the original
> ipp-get-resources drafts) so resource attributes will come before document
> attributes (0x09) and system attributes (0x0a) but after all others.
>
>
> > On May 15, 2017, at 6:55 PM, Ira McDonald <blueroofmusic at gmail.com>
> wrote:
> >
> > Hi Mike,
> >
> > Bottom line - does that mean it's OK and appropriate to have the System
> attributes
> > group (for System status changes from Printer operations) at the *end*
> (last) of the
> > response attribute groups?
> >
> > 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
> > Jan-April: 579 Park Place  Saline, MI  48176  734-944-0094
> > May-Dec: PO Box 221  Grand Marais, MI 49839  906-494-2434
> >
> >
> > On Mon, May 15, 2017 at 6:13 PM, Michael Sweet <msweet at apple.com> wrote:
> > All,
> >
> > Re: my pending action item:
> >
> >         Action: Mike to check on group ordering restrictions in CUPS
> (PENDING)
> >
> > I have the following information to provide:
> >
> > 1. The CUPS scheduler (cupsd) enforces the RFC 8011 group ordering in
> IPP requests.
> >
> > 2. The ipptool utility enforces the RFC 8011 group ordering in IPP
> responses.
> >
> > 3. The CUPS library (libcups) does not enforce the RFC 8011 group
> ordering for requests or responses.
> >
> >
> > _________________________________________________________
> > Michael Sweet, Senior Printing System Engineer
> >
> > _______________________________________________
> > ipp mailing list
> > ipp at pwg.org
> > https://www.pwg.org/mailman/listinfo/ipp
> >
>
> _________________________________________________________
> Michael Sweet, Senior Printing System Engineer
>
>
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