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Coding guidelines
Some specific obstacles, such as an ILS glide path antenna, may be located in the due to operational needs, on condition that they have the lowest possible physical strength.
A dedicated attribute (.frangible) allows coding the information that the obstacle is 'frangible', which is an operationally significant data element.
Coding example
Navaid as Obstacle (frangible)
<!-- NAVAID OBSTACLE. Area 2a RWY 09L/27R and Area 3 (Glidepath) -->
<message:hasMember>
<aixm:VerticalStructure gml:id="uuid.c9bc6ea4-2b5e-4a71-af8a-eec2e4ff3dc3">
<gml:identifier codeSpace="urn:uuid:">c9bc6ea4-2b5e-4a71-af8a-eec2e4ff3dc3</gml:identifier>
...
<aixm:name>OBS-EADD-1005 (GP 27R)</aixm:name>
<aixm:type>NAVAID</aixm:type>
...
<aixm:part>
<aixm:VerticalStructurePart gml:id="vsp00013-1">
<aixm:verticalExtent uom="M">5.0</aixm:verticalExtent>
<aixm:verticalExtentAccuracy uom="M">0.5</aixm:verticalExtentAccuracy>
<aixm:type>NAVAID</aixm:type>
<aixm:frangible>YES</aixm:frangible>
<aixm:horizontalProjection_location>
<aixm:ElevatedPoint srsName="urn:ogc:def:crs:EPSG::4326" gml:id="ep00013-1">
<gml:pos>52.378444 -31.926778</gml:pos>
<aixm:horizontalAccuracy uom="M">0.5</aixm:horizontalAccuracy>
<aixm:elevation uom="M">35.0</aixm:elevation>
<aixm:verticalDatum>EGM_96</aixm:verticalDatum>
<aixm:verticalAccuracy uom="M">0.5</aixm:verticalAccuracy>
</aixm:ElevatedPoint>
</aixm:horizontalProjection_location>
<aixm:lighting>
<aixm:LightElement gml:id="le00013-1">
<aixm:colour>RED</aixm:colour>
</aixm:LightElement>
</aixm:lighting>
</aixm:VerticalStructurePart>
</aixm:part>
<aixm:hostedNavaidEquipment xlink:href="urn:uuid:4c46c5be-b033-4673-ac70-48a5d72793d2" xlink:title="Glidepath 27R"/>
</aixm:VerticalStructureTimeSlice>
</aixm:timeSlice>
</aixm:VerticalStructure>