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rwk

12/13/11 10:20 AM

#219067 RE: dig space #219064

dig, did you

notice in the preamble to the document that it speaks to the difference between an upper case MUST,SHALL, SHOULD and MAY and the lower case version? The upper case has increased definition.

1.5 Document Conventions
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 Request for Comment (RFC) 2119 [IETF-RFC-2119]. When these words
appear in regular case, such as “should” or “may”, they are not intended to be interpreted as RFC 2119
key words.
Within this publication, the criteria for assigning requirements to MUST/SHALL, SHOULD, and MAY
are as follows:
MUSTs/SHALLs: Requirements that are needed to support the scenarios outlined in Section 2, AND
are feasible in the near term with currently available technology.
SHOULDs: Capabilities that are highly desirable and may be required in some circumstances to
support a particular operational need or robustness level.
MAYs: Optional requirements that may be desirable under some circumstances.