docs: public static Geometry symmetricDifference(Geometry leftGeometry,
  			Geometry rightGeometry, SpatialReference spatialReference) {
  		OperatorSymmetricDifference op = (OperatorSymmetricDifference) factory
  				.getOperator(Operator.Type.SymmetricDifference);
  		Geometry result = op.execute(leftGeometry, rightGeometry,
  				spatialReference, null);
  		return result;
  	}