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 Requirement [+]


Information definition




A service description shall describe the elements of the exchanged information including:

  • the name of the element;
  • the definition of the element;
  • the cardinality applicable to the element, including whether the element is optional, conditional or mandatory in the exchange;
  • constraints applicable to the element, such as:
    • datatype;
    • value ranges;
    • special values;
    • character set restrictions;
  • the semantic correspondence of the element with the AIRM; and
  • the structure and relevant relationships between the elements.


This requirement ensures that the precise meaning of the exchanged information is shared by all parties of the information exchange.


Completeness: Verify that the service description describes all elements of the exchanged information and that the required details are provided.

Consistency: Verify that the elements are consistent with each other and with the AIRM concepts used in the semantic correspondence.

Correctness: Not Applicable.


Note: The service description must describe all elements of the exchanged information at all levels, down from the service operation parameters to attributes and data types.

Note: It is best practice to base the information definition  on the requirements found in the EUROCONTROL Specification for SWIM Information Definition [RD 2], ensuring that it contains the extra details required by this requirement.

Note: The information definition can be provided by reference, for example when using an AIRM conformant standardised information exchange models, such as Aeronautical Information Exchange Model (AIXM) [RD 15] and ICAO Meteorological Information Exchange Model (IWXXM) [RD 16].  

Level of Implementation




See the Information Definition section within the Donlon TOBT Setting Service Description.

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