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: xmlwrite_xerces.m
    path of file: ./repos/OpenFace/matlab_runners/Action Unit Experiments/helpers/xml_io_tools_2010_11_05
    
    the code of the file until where you have to start completion: function varargout=xmlwrite_xerces(varargin)
%XMLWRITE_XERCES Serialize an XML Document Object Model node using Xerces parser. 
% 
    
function out = F_xmlstringinput(xString,isFullSearch,varargin)
% The function F_xmlstringinput is a copy of the private function:
% 'xmlstringinput' that the original xmlwrite function uses.

if isempty(xString)
    error('Filename is empty');
elseif ~isempty(findstr(xString,'://'))
    %xString is already a URL, most likely prefaced by file:// or http://
    out = xString;
    return;
end