RFC 1123
<networking, standard> The RFC "Requirements for Internet Hosts
Application and Support" which clarifies or changes the specification of
protocols given in earlier RFCs.
RFC 1123 defines the terms "MUST", "SHOULD", "MAY", "unconditionally compliant",
"conditionally compliant". Capitals are used to emphasise that the official
definition of the word is being used.
MUST or REQUIRED means an absolute requirement for conformance.
SHOULD or RECOMMENDED means the item can be ignored under certain circumstances,
although the full implications should be understood.
MAY or OPTIONAL means the implementor can choose, usually depending on whether
it is needed or not.
Something "unconditionally compliant" meets all the MUST and SHOULD
requirements, "conditionally compliant" meets all the MUST requirements and "not
compliant" - does not meet some MUST requirement.
For example, RFC 1123 amends RFC952 to say software MUST handle either a letter
or a digit as the first character of a hostname.
Full text.
(1996-01-13)
Nearby terms:
RFC 1094 « RFC 1112 « RFC 1119 « RFC 1123 »
RFC 1156 » RFC 1157 » RFC 1171
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