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Most airspaces may be encoded with just one AirspaceVolume, i.e. a set of vertical limits and one horizontalProjection without referencing or copying other airspace geometries.

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The geometry of most airspaces can be coded with a single AirspaceVolume, by providing  its horizontalProjection and vertical limits. In this case the attributes of the association

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class AirspaceComponentGeometry  (i.e. operation and operationSequence)

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will not be

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left empty. 

For the GML encoding of the Surface see topic Geometry.

Coding Example

The figure below shows a simple example of such an airspace, a Prohibited Area with designator EAP2.

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The figure below shows the encoding of an AirspaceVolume mapped from the AIXM UML to the AIXM XML:

Note that the coding of the upper limit does not conform with the guidelines. It should be 'FT' 'UNL' instead of 'FL' '999'.

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More coding examples can be found in the DONLON AIXM5.1.1 AIP data set filethe AIP Data Set - Specimen (DONLON).