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According to PANS-AIM, the transition altitude is only required for airspaces listed in section "AD 2.17/3.16 ATS airspace" (e.g. CTR).
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Coding example can be found in the DONLON AIXM 5.1.1 AIP data set filethe Sample AIP Data Set (DONLON).
| No. | Description | XPath Expression |
|---|---|---|
| AHP-EX-01 | Transition Altitude | //aixm:AirportHeliportTimeSlice[@gml:id='AHP_EADD']/aixm:transitionAltitude |