book.admin:
  route_name: book.admin
  title: 'List'
  base_route: book.admin
book.settings:
  route_name: book.settings
  title: 'Settings'
  base_route: book.admin
  weight: 100

entity.node.book_outline_form:
  route_name: entity.node.book_outline_form
  base_route: entity.node.canonical
  title: Outline
  weight: 2