KML Example: Loading ExtendedData

In this example, we're loading a KML file of meteorite impact structures with ExtendedData elements and using a custom template for the info window to display the loaded data. We're also using ExtendedData to load different themes for each item. Learn more about ExtendedData here. (Okay, so the dates here are a little arbitrary - sometime soon I'll figure out a good way to display dates in the negative millions of years...)