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   Any spatial address with a latitude of +90 (90) or -90 degrees will
   specify the position at the North or South Pole, respectively. The
   component for longitude may have any legal value.

   With the exception of the special condition described above, this
   form is specified in Department of Commerce, 1986, Representation of
   geographic point locations for information interchange (Federal
   Information Processing Standard 70-1):  Washington,  Department of
   Commerce, National Institute of Standards and Technology.

   The simple formula for converting degrees-minutes-seconds into
   decimal degrees is:

     decimal = degrees + minutes/60 + seconds/3600.

   Format Definition: The property is defined by the following notation:

     geo        = "GEO" geoparam ":" geovalue CRLF

     geoparam   = *(";" xparam)