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: tag2cfgsubs.m
    path of file: ./repos/PsPM/src/ext/matlabbatch/@cfg_repeat
    
    the code of the file until where you have to start completion: function [id, stop, rtaglist] = tag2cfgsubs(item, taglist, finalspec, tropts)

% function [id, stop, rtaglist] = tag2cfgsubs(item, taglist, finalspec, tropts)
% Return the index into the values branch of a configuration tree which
% corresponds to a list of tags. 
% Traversal stops if taglist contains only one element or item matches a
% non-empty tropts.stopspec. In this case, stop returns the match status.
% Id is an empty substruct, if gettag(item) matches taglist{1} and item
% matches finalspec, otherwise it is an empty cell.
% If taglist contains more than one element and taglist{2} matches any tag
% of a .val element, then the subscript index to this element is returned.
% If the recursive match was unsuccessful, it returns an empty cell and
% stop = true.
% rtaglist contains the remaining tags that were not matched due to a
% stopping criterion.
%

    
function [id, stop, rtaglist] = tag2cfgsubs(item, taglist, finalspec, tropts)

% function [id, stop, rtaglist] = tag2cfgsubs(item, taglist, finalspec, tropts)
% Return the index into the values branch of a configuration tree which
% corresponds to a list of tags. 
% Traversal stops if taglist contains only one element or item matches a
% non-empty tropts.stopspec. In this case, stop returns the match status.
% Id is an empty substruct, if gettag(item) matches taglist{1} and item
% matches finalspec, otherwise it is an empty cell.
% If taglist contains more than one element and taglist{2} matches any tag
% of a .val element, then the subscript index to this element is returned.
% If the recursive match was unsuccessful, it returns an empty cell and
% stop = true.
% rtaglist contains the remaining tags that were not matched due to a
% stopping criterion.
%
% This function is identical for all cfg_intree classes.
%
% 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: tag2cfgsubs.m 380 2016-11-08 07:47:23Z tmoser $

rev = '$Rev: 380 $'; %#ok
if numel(taglist) == 1 || (~isempty(tropts.stopspec) ...
                           && match(item, tropts.stopspec))
    if strcmp(gettag(item), taglist{1}) && match(item, finalspec)
        id = struct('type', {}, 'subs', {});
        stop = ~isempty(tropts.stopspec) ...
               && match(item, tropts.stopspec);
    else
        % tag does not match but traversal should stop
        id = {};
        stop = true;
    end