code: public OGCLineString exteriorRing() {
  		if (polygon.isEmpty())
  			return new OGCLinearRing((Polygon) polygon.createInstance(), 0,
  					esriSR, true);
  		return new OGCLinearRing(polygon, 0, esriSR, true);
  	}
docs: Returns the exterior ring of this Polygon.
  @return OGCLinearRing instance.