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AIXM 5.1.1 provides two attributes regarding navigation specifications for a RouteSegment. Both seem to be insufficient to code the designation of the PBN specification.

• navigationType is basically used to encode if the route is 'CONV 'or 'RNAV', but is not intended to code the PBN specification. Although, 'OTHER' could be used to define PBN Navigation Specifications, e.g. 'RNAV 5' or 'RNP 4'.
• requiredNavigationPerformance is intended to code RNP values. RNAV values are not considered.

Another option would be to code a FlightRestriction for a RoutePortion. A related FlightConditionElement may be encoded with a corresponding AircraftCharacteristic.navigationSpecification. The code list for this attribute CodeNaviagationSpecificationType contains all required values.

However, it is not clear if the actual intention of the FlightRestriction model of AIXM is to encode that kind of information.

The AIXM definition for FlightRestriction is:

A rule meant to regulate the use of the route network, by identifying a set of flights which fulfil a combination of elementary flow conditions and either forbidding them on a particular routing or obliging them to follow one routing out of a set of mandatory alternatives.