Document ID: chunk:federal_register_of_legislation:F2024L01443:body:0:p7
Version: federal_register_of_legislation:F2024L01443
Segment Type: other
Provision Reference: 
Character Range: 21841–26058

or does not include the option, in which case the entity MUST or MUST NOT implement the behaviour, as the case requires, to interoperate with the other implementation; or
                                                                                                                                                                                                                                                                         2.   comply with a condition imposed on the entity's approval to participate in the AGDIS under section 64 of the Act, in which case the entity MUST or MUST NOT
                                                                                                                                                                                                                                                                        implement the behaviour,
                                                                                                                                                                                                                                                                        as the case requires, to comply with that condition.
 2            MUST              Absolute requirement—the entity has no discretion in relation to the behaviour.
 3            MUST NOT          Absolute prohibition—the entity has no discretion in relation to the behaviour.
 4            NOT RECOMMENDED   There may exist valid reasons in particular circumstances when the particular behaviour is acceptable or even useful, but the full implications should be understood and the case carefully weighed before the entity implements any   Same as item 1.
                                behaviour to which this term applies
 5            OPTIONAL          Same as item 1                                                                                                                                                                                                                         Same as item 1.
 6            RECOMMENDED       There may exist valid reasons in particular circumstances to ignore a particular item, but the full implications must be understood and carefully weighed before the entity implements a different                                     Same as item 1.
                                behaviour to which this term applies

 Key words
 Item         Column 1      Column 2               Column 3
              Key word      Meaning and effect     Exception/requirement
 7            REQUIRED      Same as item 2.
 8            SHALL         Same as item 2.
 9            SHALL NOT     Same as item 3.
 10           SHOULD        Same as item 6         Same as item 1.
 11           SHOULD NOT    Same as item 4         Same as item 1.

           1.     RFC 2119 and RFC 8174 do not apply to the interpretation of a key word appearing in:
                  1.     this instrument; or
                  2.     an incorporated instrument to the extent that this instrument applies, adopts or incorporates, with or without modification, any matter contained in the incorporated instrument.

       1.     Incorporated instruments

           1.     If a provision of this instrument applies, adopts or incorporates, with or without modification, any matter contained in any other instrument or other writing (incorporated instrument), then, unless the contrary intention appears in the provision, the reference to the incorporated instrument is a reference to the incorporated instrument as in force at the commencement of this instrument.

           2.     For the avoidance of doubt, if an incorporated instrument expressly refers to or requires compliance with any other instrument or other writing, then, the reference to the other instrument or other writing is a reference to the other instrument or other writing as in force at the commencement of this instrument.

                Example: Section 10.9 of RFC 6749 provides that the authorisation server MUST require the use of TLS with server authentication as defined by RFC 2818 for certain purposes.
                RFC 2818 was obsoleted (superseded) by RFC 9110 in June 2022.