Circle and Polygon

The "Circle" element defines a substructure of "longitude, latitude 
radius".
The "Polygon" element defines a substructure of "longitude, latitude 
longitude, latitude..."

Q1: It would be useful to define a re-useable structure for longitude 
and latitude that is
used for both elements.
It would end up like this:
   <circle>
     <long>38.333</long> <lat>-122.333</lat>
     <radius>12</radius>
   </circle>
   <polygon>
     <long>38.333</long> <lat>-122.333</lat>
     <long>33.333</long> <lat>-13.333</lat>
     ...
   </polygon>

Q2: The "Polygon" element states that the first long/lat pair is 
repeated at the end of the list.
If this necessary? That is, we can assume that if it is a Polygon, the 
last long/lat pair will
have to join to the first?


Cheers...

Dr Renato Iannella
Project Leader, NICTA, Brisbane, QLD, AUSTRALIA
P: +61 7 3000 0484 F: +61 7 3000 0480 M: +61 4 1313 2206
E:  W: http://nicta.com.au


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