The instance tree of use element zoomplus:

     id = loupePlus  this = [object SVGElementInstance]  correspondingElement = [object SVGGElement]
          id = useRim  this = [object SVGElementInstance]  correspondingElement = [object SVGUseElement]
               id = rim  this = [object SVGElementInstance]  correspondingElement = [object SVGCircleElement]

