Title: Key words for use in RFCs to Indicate Requirement Levels
Author(s): S. Bradner.
Status: BEST CURRENT PRACTICE
Date: Mar 1997
Length: 4723
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
RFC2119.
Note that the force of these words is modified by the requirement level of the document in which they are used.
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