id:
string
A string identifying the element group.
name:
string
The name of the element group. This is shown in the legend.
caption:
null|string
The caption of the element group. This is shown in the legend.
elementIds:
string[]
The ids of the elements in the element group.
Remarks
You can use these ids to get the full element objects via the getElements method.
visible:
boolean
Whether the element group is visible or not.
shownInLegend:
boolean
Whether the element group is shown in the legend or not.