*****
Content-Type: application/json

{
   "nodes":[
      {
         "icon":"iVBORw0KGgoAAAANSUhEUgAAABIAAAASCAYAAABWzo5XAAAACXBIWXMAAA9hAAAPYQGoP6dpAAAA5klEQVQ4je3QPw/BQBjH8V/LJdfKdSAXEXZhsIiBd2CyWsS7MFnF4pWY+x4MIhIDfQFYhMR/0rsy0EiqklaMvslN99wnTw7494sKz/NdmhYtM04tg9OtwemWcTojOil9mlc+IpmYWWsX40rkMSKFA7MzWm8W56p9soeBIMapVe9Vsi7iJm0H/dbA2q8uOe8b1ccpKEDKiwBAhKiAgzSAfBDoq/ygyQ3KUgrn7UJcJaBiDmAaaCNxEE2zM1pL+4WJq4TZHW8uR9kItSrRSYlxbcYSdMcSdGck9SnRSTEU4ikPn8/9F747d+tCtRm7EewAAAAASUVORK5CYII=",
         "title":"A test vector layer",
         "type":"layer"
      }
   ],
   "title":""
}