{
 "layers": [
  {
   "layerId": 0,
   "layerName": "Line",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "<Null>",
     "url": "d08759e2d621e3bd8fa98028879f3858",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAeElEQVQ4jWNhoDJgGTVwJITh5ggTBwYmBgeG///tKTbtP2MjC68g/35JBQUGXgEBisz6/OEDw/MHDxxYqGEYCIDNUFCgQRg+f/AAbDKVvMzA8vn9R8fPHy7UU+w0RsaDDP8YDrD4rjhzgIGBAYRHSsJmGDWQgUIAAP8mIoWqOe2MAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "groupId": "0",
     "height": 20,
     "width": 20,
     "values": [
      "<Null>"
     ]
    },
    {
     "label": "<all other values>",
     "url": "2706cf82f2812c491450f1076003d5bc",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAQ0lEQVQ4jWNhoDJgGTWQYsBCuRGoYKQa2NjY2MDExGRPiUH//v07WF9f30AbF9bX1zdQ1UBqAhaqmsYwaiA1wOCPFADEmwpOOTfaCgAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "groupId": "1",
     "height": 20,
     "width": 20
    }
   ],
   "legendGroups": [
    {
     "id": "0",
     "heading": "test"
    },
    {
     "id": "1",
     "heading": ""
    }
   ]
  }
 ]
}