document:
  nodes:
    - object: block
      data:
        id: the-id
      type: header_one
      nodes:
        - object: text
          leaves:
            - text: Heading 1
    - object: block
      type: header_two
      nodes:
        - object: text
          leaves:
            - text: Heading 2
    - object: block
      type: header_three
      nodes:
        - object: text
          leaves:
            - text: Heading 3
    - object: block
      type: header_four
      nodes:
        - object: text
          leaves:
            - text: Heading 4
    - object: block
      type: header_five
      nodes:
        - object: text
          leaves:
            - text: Heading 5
    - object: block
      type: header_six
      nodes:
        - object: text
          leaves:
            - text: Heading 6