A container class for graphic label Display Rule settings.
These values are tightly bound, thus it is not advised to change any values without due consideration.
FOR INTERNAL USE
A URL to an image that will be used as the background for a graphic label
The content area of the graphic label, it must contain exactly 4 values, with the order corresponding to (left, top, right, bottom)
Segments where the graphic label is allowed to stretch the image in the X-axis, each sublist must contain 2 values, which are from and to values.
Segments where the graphic label is allowed to stretch the image in the Y-axis, each sublist must contain 2 values, which are from and to values, the first value must not be larger than the second value.