Smallest bounding box that encloses all strokes in the group.
Unix timestamp (ms) when the last stroke ended.
null if the group is still accumulating strokes.
Unique group identifier (UUID v4).
Unix timestamp (ms) when the first stroke in the group began.
IDs of every Stroke that belongs to this group, in temporal order.
A semantically related cluster of strokes — typically one mathematical symbol, digit, or operator as grouped by StrokeGrouping.