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RFC 2119

RFC 2119 is an IETF standard defining precise meaning of key words apearing in other Request for Comments papers used to signify the requirements in the specification. These words are often capitalized.

Such words are :

  • MUST
  • MUST NOT
  • REQUIRED
  • SHALL
  • SHALL NOT
  • SHOULD
  • SHOULD NOT
  • RECOMMENDED
  • MAY
  • OPTIONAL
  • = External links =

  • [http://www.ietf.org/rfc/rfc2119.txt RFC 2119 Key words for use in RFCs to Indicate Requirement Levels]