content: <fold text='{...}'>{
      empty: {}
      oneline: <fold text='{...}'>{foo: 1, bar: 2}</fold>
      Text: "loading image....",
      TextAttrs: <fold text='{...}'>{
          Color:"#A0FFFFFF",
          Font:"Small",
          HAlign:"HCenter",
          VAlign:"VCenter",
          Direction:"LeftToRight"
      }</fold>,
      TargetRect: <fold text='{...}'>{
          x:0,
          y:0,
          w:int(obj.canvasrect.w),
          h:0
      }</fold>
  }</fold>