document:
  nodes:
    # orphan item
    - object: block
      type: paragraph
      nodes:
        - object: text
          leaves:
            - text: "Orphan"

    - object: block
      type: ul_list
      nodes:
        - object: block
          type: list_item
          nodes:
            - object: block
              type: paragraph
              nodes:
                - object: text
                  leaves:
                    - text: "Valid item"

        - object: block
          type: list_item
          nodes:
            - object: block
              type: paragraph
              nodes:
                - object: text
                  leaves:
                    - text: "Direct child of another item"