This is an old revision of the document!
The point.xml file contains pre-defined points which can be referenced by their id in <point> elements. This makes maintenance of coordinates much simpler and significantly improves the readability of your map files. Especially when visualizing airways, SID, STAR or any other procedures.
A point element needs to be defined in the points.xml file:
<points> <point id="COA" lat="N0512053002" lon="E0032119001"/> </points>
You can then reference that point in any map, replacing latitude/longitude or cartesian x/y pairs.
<nav id="COA" symbol="vor" color="symbol_vor" lat="N0512053002" lon="E0032119001"/>
could be replaced by:
<nav id="COA" symbol="vor" color="symbol_vor" ref="COA" />
Another example …
<circle radius="10" segments="64" r="255" g="0" b="0"> <point lat="N0512053002" lon="E0032119001"/> </circle>
could be replaced by:
<circle radius="10" segments="64" r="255" g="0" b="0"> <point ref="COA"/> </circle>