(0) (default) - The KML node's visibility is tied to its item's checkbox.
(1) When specified for a Container, only one of the Container's items is visible at a time.
(2) Use a normal checkbox for visibility but do not display the Container or Network Link's children in the list view. A checkbox allows the user to toggle visibility of the child objects in the viewer.
(-1) Unknown KML geometry type.
(3) Everything in the container or network link can be turned off all at once. Prevents nodes from becoming visible simultaneously. Child nodes must be enabled individually. This is useful if the container or network link contains a large amount of data.