public IEnumerable<JObject> ReadSurfaceElement(IAixmConverter converter, JObject currentObject, XElement element)
        {
           
            //Convert ElevatedSurface to a GML Surface and convert to geojson.
            var geometry = GeometryFactory.GmlToGeometry(DownCastToSurfaceElement(element));

            //Set the geometry
            currentObject.SetGeometry(geometry);

            //Set the projection on the feature obj.
            currentObject.SetSrs(element);

            return Enumerable.Empty<JObject>();

          
        }
        public IEnumerable<JObject> ReadElement(IAixmConverter converter, JObject currentObject, XElement element)
        {
            XNamespace aximNs = "http://www.aixm.aero/schema/5.1";

            //Convert ElevatedPoint to a GML Surface and convert to geojson.
            var geometry = GeometryFactory.GmlToGeometry(DownCastToPointElement(element));
                       
            //Set the geometry
            currentObject.SetGeometry(geometry);

            //Set the projection on the feature obj.
            currentObject.SetSrs(element);

            //Read elevation property and return
            return converter.ReadElement(currentObject, element.Elements(aximNs + "elevation"));
        }