@darius It's a parallel universe with a similar evolutionary curve, though: for instance WKT to GeoJSON with a few dead intermediary XML relatives isn't that different from the INI/DSL or worse ASN.1 formats through XML into modern JSON formats.
Just about everything speaks GeoJSON these days and there are all sorts of converters around.
Coordinate systems are like timezone math, you can probably ignore them (right up until they try to eat you because you want to schedule trains through them).
