code: function(point) {
          if (this.internalProjection && this.externalProjection) {
              point = point.clone();
              point.transform(this.internalProjection, 
                                 this.externalProjection);
          }
          return point.x + "," + point.y;                     
      }
docs: Method: buildCoordinates
  
  Parameters:
  point - {<OpenLayers.Geometry.Point>}
  
  Returns
  {String} a coordinate pair