How can I edit an xml file using java api in Matlab ?

Hi,

I would like to replace text in an xml file using the org.w3c.dom package in Matlab, specifically the text between help_location

Here is the xml file :

<productinfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="optional">
    <?xml-stylesheet type="text/xsl"href="optional"?>
    <matlabrelease>2013b</matlabrelease>
    <name>Library</name>
    <type>other</type>
    <icon></icon>
    <help_location>C:\Users\user\Desktop\Library/html</help_location>
    <help_contents_icon>$toolbox/matlab/icons/bookicon.gif</help_contents_icon>
</productinfo>

and the extract from the m file :

function lib_help_Callback(hObject, eventdata, handles)
% hObject    handle to lib_help (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

pwd;
currentfolder = pwd; 

xDoc = xmlread(fullfile(('info.xml')));
allListItems = xDoc.getElementsByTagName('productinfo');
allListItems = allListItems.item(0);
thisListItem=allListItems.getElementsByTagName('help_location');
thisListItem=thisListItem.item(0);
textNode = thisListItem.childNodes(0);
textNode.replaceWholeText(currentfolder);

builddocsearchdb(currentfolder);
doc;

do I have to use xmlwrite to overwrite the info.xml file afterwards ? If so please specify how.

Thanks in advance.