root:
  items:
    - type: clip
      id: 1
      bounds: [0, 0, 200, 200]
    - type: clip-chain
      id: 2
      clips: [1]
    - image: xy-gradient(200, 200)
      bounds: 0 0 400 200
      stretch-size: 400 200
      clip-chain: 2