docs: def assign_comment_to_book(self, comment_id, book_id):
          """Adds an existing ``Comment`` to a ``Book``.
  
          arg:    comment_id (osid.id.Id): the ``Id`` of the ``Comment``
          arg:    book_id (osid.id.Id): the ``Id`` of the ``Book``
          raise:  AlreadyExists - ``comment_id`` is already assigned to
                  ``book_id``
          raise:  NotFound - ``comment_id`` or ``book_id`` not found
          raise:  NullArgument - ``comment_id`` or ``book_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for
          # osid.resource.ResourceBinAssignmentSession.assign_resource_to_bin
          mgr = self._get_provider_manager('COMMENTING', local=True)
          lookup_session = mgr.get_book_lookup_session(proxy=self._proxy)
          lookup_session.get_book(book_id)  # to raise NotFound
          self._assign_object_to_catalog(comment_id, book_id)