schema:
  type: object
  constraint: next.chld1.exists() && next.chld2.exists()
  properties:
    chld1:
      type: object
      constraint: next.grnd1.exists() && next.grnd2.exists()
      properties:
        grnd1:
          type: string
        grnd2:
          type: string
    chld2:
      type: object
      constraint: next.grnd3.exists() && next.grnd4.exists()
      properties:
        grnd3:
          type: string
        grnd4:
          type: string

access:
  - location: "/"
    write: true