KML

Keyhole Markup Language (KML) is an XML notation for expressing geographic annotation and visualization within two-dimensional maps and three-dimensional Earth browsers (Wikipedia).

The KML format is an Open Geospatial Consortium standard. The KML format was originally developed for use with Google Earth (which was originally named Keyhole Earth Viewer).

Loader	Characteristic
File Format	KML
File Extension	`.kml`
MIME Type	`application/vnd.google-earth.kml+xml`
File Type	XML (Text)

KML file format support is currently in beta status. Known limitations include

No support for .kmz files

No adjustment of geoid-relative elevations

Non-geometry features are filtered out

Sample document

XML

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
<Placemark>
  <name>New York City</name>
  <description>New York City</description>
  <Point>
    <coordinates>-74.006393,40.714172,0</coordinates>
  </Point>
</Placemark>
</Document>
</kml>