A string identifying the layer group.
The name of the layer group. This is shown in the legend.
The caption of the layer group. This is shown in the legend.
The ids of the layers in the layer group.
Whether the layer group is visible or not.
Whether the layer group is shown in the legend or not.
bounds: null | [number, number, number, number]
The bounding box of the layer group in [west, south, east, north] order.