code: def get_assets_by_ids(self, asset_ids=None):
          
          return AssetList(self._provider_session.get_assets_by_ids(asset_ids),
                           self._config_map)
docs: Gets an ``AssetList`` corresponding to the given ``IdList``.
  
          In plenary mode, the returned list contains all of the assets
          specified in the ``Id`` list, in the order of the list,
          including duplicates, or an error results if an ``Id`` in the
          supplied list is not found or inaccessible. Otherwise,
          inaccessible ``Assets`` may be omitted from the list and may
          present the elements in any order including returning a unique
          set.
  
          arg:    asset_ids (osid.id.IdList): the list of ``Ids`` to
                  retrieve
          return: (osid.repository.AssetList) - the returned ``Asset
                  list``
          raise:  NotFound - an ``Id`` was not found
          raise:  NullArgument - ``asset_ids`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*