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    <gmd:geographicElement>
     <gmd:EX_BoundingPolygon>
      <gmd:polygon> - various options exist for completing the polygon. Please refer to the ¿Guidance"Guidance and Profile of GML for use with Aviation Data¿ [5]Data".</gmd:polygon>
     </gmd:EX_BoundingPolygon>
    </gmd:geographicElement>
   </gmd:extent>
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