.kml

Keyhole Markup Language

Dedicated renderer

Format facts

MIME type: application/vnd.google-earth.kml+xml
Apple UTI: com.google.earth.kml
Stock Quick Look: shown as plain text
Planned approach (census): syntax-highlight
Icon hint: generic-icon
Prevalence: common

Renderer note (from the census)

pure Go XML parse for placemarks

Gotchas: Google Earth