You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: harvest.m
    path of file: ./repos/spm/matlabbatch/@cfg_item
    
    the code of the file until where you have to start completion: function [tag, val, typ, dep, chk, cj] = harvest(item, cj, dflag, rflag)

% function [tag, val, typ, dep, chk, cj] = harvest(item, cj, dflag, rflag)
% Generic harvest function, suitable for all const/entry items.
% The configuration tree cj is passed unmodified. If rflag is true and a
% dependency can be resolved, the resolved value will be returned,
% otherwise the cfg_dep objec
    
function and its
%       children's check functions. A job is ready to run if all
%       dependencies are resolved and chk status is true.
%
% This code is part of a batch job configuration system for MATLAB. See
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: harvest.m 8183 2021-11-04 15:25:19Z guillaume $

rev = '$Rev: 8183 $'; %#ok

typ = class(item);
tag = item.tag;
val = '<UNDEFINED>';
dep = []; % Placeholder for depend