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BCP 14

RFC 8174

Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words, May 2017

File formats:

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Status:

BEST CURRENT PRACTICE

Updates:

RFC 2119

Author:

B. Leiba

Stream:

IETF

Source:

NON WORKING GROUP

Cite this RFC: TXT | XML | BibTeX

DOI: https://doi.org/10.17487/RFC8174

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Abstract

RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.