[IPP] Definition for Conditionally Required

[IPP] Definition for Conditionally Required

[IPP] Definition for Conditionally Required

Michael Sweet msweet at apple.com
Mon Jul 13 21:21:04 UTC 2015


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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