A KML node is an element definition within a KML document. A KML node can be:
- a container, such as a folder with additional sub-nodes.
- a geometry node, which is a node with an associated geometry. Geometry nodes can be placemarks, 3D models, polygons, lines, or multigeometry.
A KML node can have nested XML elements and attributes to define objects such as display balloons (pop-ups or callouts), ground overlays, screen overlays, folders/documents, or network links. KML nodes are shown as sublayers of the KML layer in the Contents pane.