KML node

A KML node is an element definition within a KML document. A KML node can be a container (such as a folder with additional child nodes) or a geometry node (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 things such as display balloons (pop-ups or callouts), ground overlays, screen overlays, folders / documents, network links, and so on.