docs: def get_child_bins(self, bin_id):
          """Gets the children of the given bin.
  
          arg:    bin_id (osid.id.Id): the ``Id`` to query
          return: (osid.resource.BinList) - the children of the bin
          raise:  NotFound - ``bin_id`` not found
          raise:  NullArgument - ``bin_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.BinHierarchySession.get_child_bins
          if self._catalog_session is not None:
              return self._catalog_session.get_child_catalogs(catalog_id=bin_id)
          return BinLookupSession(
              self._proxy,
              self._runtime).get_bins_by_ids(
                  list(self.get_child_bin_ids(bin_id)))