[Gnso-newgtld-wg] MUST, SHOULD, SHALL etc

Maxim Alzoba m.alzoba at gmail.com
Tue May 26 16:38:39 UTC 2020


Hello All, 

IETF language is for RFCs and other activities of IETF, 
we do use language for policy and contracts texts, so we tend to use more legal like meanings.

Sincerely Yours,

Maxim Alzoba
Special projects manager,
International Relations Department,
FAITID

m. +7 916 6761580(+whatsapp)
skype oldfrogger

Current UTC offset: +3.00 (.Moscow)

> On 26 May 2020, at 19:33, Aikman-Scalese, Anne <AAikman at lrrc.com> wrote:
> 
>  <>Jeff, Cheryl, et al – below I paste the IETF definitions that were linked – note, for example, that “should” says “can be ignored” under certain circumstances – not sure anyone in the WG ever had that understanding of “should”.
>  
> Anne
>  
> Network Working Group                                         S. Bradner
> Request for Comments: 2119                            Harvard University
> BCP: 14                                                       March 1997
> Category: Best Current Practice
>  
>  
>        
> Key words for use in RFCs to Indicate Requirement Levels
>  
>  
> Status of this Memo
>  
>    This document specifies an Internet Best Current Practices for the
>    Internet Community, and requests discussion and suggestions for
>    improvements.  Distribution of this memo is unlimited.
>  
> Abstract
>  
>    In many standards track documents several words are used to signify
>    the requirements in the specification.  These words are often
>    capitalized.  This document defines these words as they should be
>    interpreted in IETF documents.  Authors who follow these guidelines
>    should incorporate this phrase near the beginning of their document:
>  
>       The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
>       NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and
>       "OPTIONAL" in this document are to be interpreted as described in
>       RFC 2119 <https://tools.ietf.org/html/rfc2119>.
>  
>    Note that the force of these words is modified by the requirement
>    level of the document in which they are used.
>  
>  <>1 <https://tools.ietf.org/html/rfc2119#section-1>. MUST  
>  This word, or the terms "REQUIRED" or "SHALL", mean that the
>    definition is an absolute requirement of the specification.
>  
>  <>2 <https://tools.ietf.org/html/rfc2119#section-2>. MUST NOT  
>  This phrase, or the phrase "SHALL NOT", mean that the
>    definition is an absolute prohibition of the specification.
>  
>  <>3 <https://tools.ietf.org/html/rfc2119#section-3>. SHOULD  
>  This word, or the adjective "RECOMMENDED", mean that there
>    may exist valid reasons in particular circumstances to ignore a
>    particular item, but the full implications must be understood and
>    carefully weighed before choosing a different course.
>  
>  <>4 <https://tools.ietf.org/html/rfc2119#section-4>. SHOULD NOT  
>  This phrase, or the phrase "NOT RECOMMENDED" mean that
>    there may exist valid reasons in particular circumstances when the
>    particular behavior is acceptable or even useful, but the full
>    implications should be understood and the case carefully weighed
>    before implementing any behavior described with this label.
>  
>  
>  
>  
>  
> Bradner                  Best Current Practice                  [Page 1]
>  <> <https://tools.ietf.org/html/rfc2119#page-2>
> RFC 2119 <https://tools.ietf.org/html/rfc2119>                     RFC Key Words                    March 1997
>  
>  
>  <>5 <https://tools.ietf.org/html/rfc2119#section-5>. MAY  
>  This word, or the adjective "OPTIONAL", mean that an item is
>    truly optional.  One vendor may choose to include the item because a
>    particular marketplace requires it or because the vendor feels that
>    it enhances the product while another vendor may omit the same item.
>    An implementation which does not include a particular option MUST be
>    prepared to interoperate with another implementation which does
>    include the option, though perhaps with reduced functionality. In the
>    same vein an implementation which does include a particular option
>    MUST be prepared to interoperate with another implementation which
>    does not include the option (except, of course, for the feature the
>    option provides.)
>  
>  <>6 <https://tools.ietf.org/html/rfc2119#section-6>. Guidance in the use of these Imperatives
>  
>  
>    Imperatives of the type defined in this memo must be used with care
>    and sparingly.  In particular, they MUST only be used where it is
>    actually required for interoperation or to limit behavior which has
>    potential for causing harm (e.g., limiting retransmisssions)  For
>    example, they must not be used to try to impose a particular method
>    on implementors where the method is not required for
>    interoperability.
>  
>  <>7 <https://tools.ietf.org/html/rfc2119#section-7>. Security Considerations
>  
>  
>    These terms are frequently used to specify behavior with security
>    implications.  The effects on security of not implementing a MUST or
>    SHOULD, or doing something the specification says MUST NOT or SHOULD
>    NOT be done may be very subtle. Document authors should take the time
>    to elaborate the security implications of not following
>    recommendations or requirements as most implementors will not have
>    had the benefit of the experience and discussion that produced the
>    specification.
>  
>  <>8 <https://tools.ietf.org/html/rfc2119#section-8>. Acknowledgments
>  
>  
>    The definitions of these terms are an amalgam of definitions taken
>    from a number of RFCs.  In addition, suggestions have been
>    incorporated from a number of people including Robert Ullmann, Thomas
>    Narten, Neal McBurnett, and Robert Elz.
>  
>  
>  
> Anne E. Aikman-Scalese
> Of Counsel
> 520.629.4428 office
> 520.879.4725 fax
> AAikman at lrrc.com <mailto:AAikman at lrrc.com>
> _____________________________
> 
> Lewis Roca Rothgerber Christie LLP
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> 
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