IPP> Required IPP attributes - missing list anywhere

Hi,

Paul Tykodi's asked at today's IPP WG telecon how to find
the list of required IPP/1.1 attributes (i.e., ones that all IPP/1.1
Printer objects MUST support).

I said (incorrectly) that this was listed in the IPP Registry, but
sadly it's not.  There is no such single list.  In all IPP specs,
the required attributes are documented (but not very well).
For basic IPP/1.1 (RFC 2911), they are listed at:

- Section 3.1.4.1 Request Operation Attributes - page 25
  - attributes-charset and attributes-natural-language
- Section 3.1.4.2 Response Operation Attributes - page 29
  - attributes-charset and attributes-natural-language
- Section 3.2  Printer Operations
  - some REQUIRED operation attributes
- Section 3.3  Job Operations
  - some REQUIRED operation attributes
- Section 4.2 Job Template Attributes - page 91
  - all OPTIONAL
- Section 4.3 Job Description Attributes - page 106
  - see table
- Section 4.4 Printer Description Attributes - page 124
  - see table

All - I think Paul's raised a good point - the list of basic
IPP/1.1 (and therefore IPP/2.0) REQUIRED operation
and description attributes does NOT exist - Should it
be added in a normative appendix to the IPP/2.0 spec?

The IANA IPP Registry (complete for all IETF RFCs but
not for any PWG IPP Extensions) is at:

  http://www.iana.org/assignments/ipp-registrations
  (a plaintext file)

Cheers,
- Ira

--

-- 
Ira McDonald (Musician / Software Architect)
Chair - Linux Foundation Open Printing WG
Blue Roof Music/High North Inc
email: blueroofmusic <at> gmail.com
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