anchor.diff:  list_children(Entry, Offset, Count) ->
       ?run(begin
           {ok, #document{} = File} = get(Entry),
  -        set_link_context(File),
           Res = datastore:foreach_link(?LINK_STORE_LEVEL, File,
               fun
                   (_LinkName, _LinkTarget, {_, 0, _} = Acc) ->
  
positive.code:             Error
      end;
  get_child(Doc, Name) ->
      file_meta:set_link_context(Doc),
      case datastore:fetch_full_link(?LINK_STORE_LEVEL, Doc, Name) of
          {ok, {_, Targets}} ->
              {ok, [UUID || {_, _, UUID, _} <- Targets]};
  
negative.code: location_ref(ProviderId) ->
      <<?LOCATION_PREFIX, ProviderId/binary>>.
  
  
  %%--------------------------------------------------------------------
  %% @doc
  