old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from .views import AdminHandler, CubeHandler, ConnectionHandler
  
  INCLUDE_URLS = [
      (r"/admin", AdminHandler),
      (r"/admin/connection", ConnectionHandler),
      (r"/admin/cube/?(?P<slug>[\w-]+)?", CubeHandler),
  ]
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from .views import AdminHandler, CubeHandler, ConnectionHandler
  from .views import ElementHandler
  
  
  INCLUDE_URLS = [
      (r"/admin", AdminHandler),
      (r"/admin/connection", ConnectionHandler),
      (r"/admin/cube/?(?P<slug>[\w-]+)?", CubeHandler),
      (r"/admin/element/?(?P<slug>[\w-]+)?", ElementHandler),
  ]
  
subject: Add Element admin view in admin url