[1] GPX - GPS Exchange Format ( 版) http://www.gdal.org/drv_gpx.html

<extensions>

navaid:nameTOTAL RF</navaid:name>

navaid:addressBENSALEM</navaid:address>

navaid:statePA</navaid:state>

navaid:countryUS</navaid:country>

navaid:frequencies

navaid:frequency type="CTAF" frequency="122.900" name="CTAF"/

</navaid:frequencies>

navaid:runways

navaid:runway designation="H1" length="80" width="80" surface="ASPH-G"

</navaid:runway>

</navaid:runways>

navaid:magvar12</navaid:magvar>

</extensions>