SurfaceSections
| Element | Type | Description | 
|---|---|---|
| @used | Bool | Whether surface sectioning is enabled. | 
| @xMin | 64f | The minimum valid X value to be used for section definition. | 
| @xMax | 64f | The maximum valid X value to be used for section definition. | 
| @yMin | 64f | The minimum valid Y value to be used for section definition. | 
| @yMax | 64f | The maximum valid Y value to be used for section definition. | 
| Section | Collection | 
                             A series of Section elements.  |