[IPP] Definition for Conditionally Required

[IPP] Definition for Conditionally Required

[IPP] Definition for Conditionally Required

Ira McDonald blueroofmusic at gmail.com
Mon Jul 13 22:26:18 UTC 2015


Hi,

I second all of Mike's comments.

I'd rather have no definition at all than have one that is obscure or has
too much latitude in interpretation.

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 Mon, Jul 13, 2015 at 5:21 PM, Michael Sweet <msweet at apple.com> wrote:

> Bill,
>
> Comments inline...
>
> _________________________________________________________
> Michael Sweet, Senior Printing System Engineer, PWG Chair
>
> On Jul 13, 2015, at 12:47 PM, wamwagner at comcast.net wrote:
>
> ...
>
> I am unhappy with "... conformance requirement that applies to a
> particular capability or feature." as a general statement because:
>
>             a. Most conformance requirements apply to a particular
> capability or feature. I assume that one is to infer that the requirement
> applies only if that capability or feature exists in the subject
> implementation seeking to be conformant.
>
> Per RFC 2119, REQUIRED, MUST, and MUST NOT are unconditional by
> themselves.  You make them conditional by making the statement containing
> them conditional, e.g., 'If the Printer supports two-sided printing, the
> Printer MUST support the "sides" Job Template attribute.'
>
> ...
>
> There is there is the additional question as to whether the term should
> 'Conditionally Required" or "Conditionally Mandatory". Since the basic
> compliance term is "Required", "Conditionally Required" seems more
> appropriate.
>
> Agreed.
>
> A reasonable variation on the 2003 definition and the RFC2119 definition
> of requirement levels is :
>
> *CONDITIONALLY REQUIRED*: definition is a requirement of the
> specification if the specified condition is true.
>
> I'm not super happy with this...
>
> One might prefer a term other than "definition", such as capability or
> feature, and consider a requirement of the implementation rather than of
> the specification, but RFC 2119 wording  is:" … definition is an absolute
> requirement of the specification."
>
> Alternatively, we could modify the current definition to:
>
> *CONDITIONALLY REQUIRED*: A conformance requirement that applies if the
> specified condition is true.
>
> I like this better, or the definition you quoted from 5100.6:
>
> "The term CONDITIONALLY REQUIRED means that the Printer MUST support the
> feature, if the specified condition is true."
>
>
>
>
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>
>
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