Spatial Domain
The following elements comprise the Spatial Domain reference:
	Bounding Coordinates, mandatory the limits of coverage of a data set expressed by latitude and longitude values in the order western-most, eastern-most, northern-most, and southern-most. For data sets that include a complete band of latitude around the earth, the West Bounding Coordinate shall be assigned the value -180.0, and the East Bounding Coordinate shall be assigned the value 180.0.
	Data Set G-Polygon, optional coordinates defining the outline of an area covered by a data set.
	Data Set G-Polygon Outer Ring, mandatory if applicable closed nonintersecting boundary of an interior area.
	Data Set G-Polygon Exclusion Ring, mandatory if applicable the closed nonintersecting boundary of a void area (or "hole") in an interior area.
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