properties:
  uid:
    type: string
  book_id:
    type: string
  paragraph:
    type: string
  word_start:
    type: string
  word_end:
    type: string
  content:
    type: string
  content_type:
    type: string
  channel_uid:
    type: string
  editor_uid:
    type: string
  language:
    type: string
  updated_at:
    type: string
  created_at:
    type: string