document:
  nodes:
  - object: block
    type: ul_list
    nodes:
    - object: block
      type: list_item
      nodes:
      - object: block
        type: paragraph
        nodes:
        - object: text
          leaves:
            - text: 'First item'

  - object: block
    type: paragraph
    nodes:
    - object: text
      leaves:
        - text: ''