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RFC 2119 - Key words for use in RFCs to Indicate Requirement Levels

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IETF - Internet Engineering Task Force

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RFC 2119: Key words for use in RFCs to Indicate Requirement Levels

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https://datatracker.ietf.org/doc/rfc2119/

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IETF Datatracker

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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. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.

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