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MUST

Overview#

MUST or the terms "REQUIRED" or "SHALL", (RFC 2119), which are Case-sensitive (RFC 8174) mean that the definition is an absolute requirement of the specification.

An implementation which does not include this particular option MUST be prepared to interoperate with another implementation which does include the option, though perhaps with reduced functionality.

In the same vein an implementation which does include this particular option MUST be prepared to interoperate with another implementation which does not include the option (except, of course, for the feature the option provides.)

We may use MUST in other contexts but we are implying the same interpretation as a Best Current Practice

LDAP#

MUST or the term "REQUIRED" indicates the Attributes that MUST contain values within the specified ObjectClass.

More Information#

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