anchor.diff:  %% API functions
   %% ====================================================================
   
  +%% get_file_owner/1
  +%% ====================================================================
  +%% @doc Fetches owner's username and UID for given file.
  +%%      Returns {"", -1} on error.
  +-spec get_file_owner(File :: file_doc() | file_info() | file()) -> Owner | Error when
  +    Owner :: {Login :: string(), UID :: integer()} |
  +    Error :: {[], -1}.
  +%% ====================================================================
   get_file_owner(#file{} = File) ->
       case user_logic:get_user({uuid, File#file.uid}) of
           {ok, #veil_document{record = #user{}} = UserDoc} ->
  
positive.code: %% cited in 'LICENSE.txt'.
  %% @end
  %% ===================================================================
  %% @doc: Write me !
  %% @end
  %% ===================================================================
  -module(fslogic_file).
  
negative.code: %% normalize_file_type/2
  %% ====================================================================
  %% @doc Translates given file type into internal or protocol representation
  %%      (types file_type() and file_type_protocol() respectively) <br/>
  %%      This method can and should be used in order to ensure that given file_type
  %%      has requested format.
  -spec normalize_file_type(protocol | internal, file_type() | file_type_protocol()) -> file_type() | file_type_protocol().
  %% ====================================================================
  normalize_file_type(protocol, ?DIR_TYPE) ->
  