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: initialise.m
    path of file: ./repos/bspm/thirdparty/spm12/matlabbatch/@cfg_branch
    
    the code of the file until where you have to start completion: function item = initialise(item, val, dflag)

% function item = initialise(item, val, dflag)
% Initialise a configuration tree with values. If val is a job
% struct/cell, only the parts of the configuration that are present in
% this job will be initialised.
% If val has the special value '<DEFAULTS>', the entire configuration
% will be updated with values from .def fields. If a .def field is
% present in a cfg_leaf item, the current default value will be inserted,
% possibly replacing a previously entered (default) value.
% dflag is ignored in a cfg_branch.
%
% 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

    
function item = initialise(item, val, dflag)

% function item = initialise(item, val, dflag)
% Initialise a configuration tree with values. If val is a job
% struct/cell, only the parts of the configuration that are present in
% this job will be initialised.
% If val has the special value '<DEFAULTS>', the entire configuration
% will be updated with values from .def fields. If a .def field is
% present in a cfg_leaf item, the current default value will be inserted,
% possibly replacing a previously entered (default) value.
% dflag is ignored in a cfg_branch.
%
% 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: initialise.m 4898 2012-09-05 13:40:16Z volkmar $

rev = '$Rev: 4898 $'; %#ok

if strcmp(val,'<DEFAULTS>')
    item = initialise_def(item, val, dflag);
elseif isstruct(val)
    item = initialise_job(item, val, dflag);
else
    cfg_message('matlabbatch:initialise', ...
                'Can not initialise %s: job is not a struct.', ...
                gettag(item));
end