text: """Radicale urls."""
  
  from rest_framework_nested import routers
  
  from . import viewsets
  
  router = routers.SimpleRouter()
  router.register(
      r"user-calendars", viewsets.UserCalendarViewSet,
      base_name="user-calendar")
  router.register(
      r"shared-calendars", viewsets.SharedCalendarViewSet,
      base_name="shared-calendar")
  router.register(
      r"attendees", viewsets.AttendeeViewSet, base_name="attendee")
  router.register(
      r"mailboxes", viewsets.MailboxViewSet, base_name="mailbox")
  router.register(
      r"accessrules", viewsets.AccessRuleViewSet, base_name="access-rule")
  
  calendars_router = routers.NestedSimpleRouter(
      router, r"user-calendars", lookup="calendar")
  calendars_router.register(
      r"events", viewsets.UserEventViewSet, base_name="event")
  shared_calendars_router = routers.NestedSimpleRouter(
      router, r"shared-calendars", lookup="calendar")
  shared_calendars_router.register(
      r"events", viewsets.SharedEventViewSet, base_name="event")
  
  urlpatterns = (
      router.urls + calendars_router.urls + shared_calendars_router.urls
  )
  