[IPP] Report on CUPS attribute group ordering restrictions

[IPP] Report on CUPS attribute group ordering restrictions

[IPP] Report on CUPS attribute group ordering restrictions

Michael Sweet msweet at apple.com
Mon May 15 23:56:04 UTC 2017


Ira,

> On May 15, 2017, at 7:36 PM, Ira McDonald <blueroofmusic at gmail.com> wrote:
> 
> Hi Mike,
> 
> Thanks.
> 
> AFAIK there will never be a Document attributes group in a System Service operation?

Certainly for any of the operations we are defining in the IPP System Service spec.

> 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
> 
> 

_________________________________________________________
Michael Sweet, Senior Printing System Engineer



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