Personally I'm not a big fan of the HEREDOC method because of the increased
overheads. I prefer to stick to standard single quotes strings unless I am using
special characters such as n t etc.

>From your sample code I don't understand why you are using HEREDOC. I'd just
use:

<?php
header('Content-type: application/vnd.mozilla.xul+xml');
?>
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
<?xml-stylesheet href="_graal.css" type="text/css"?>
<window title="test" id="test"
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";>
<vbox id="hbox_panneaudegauche" flex="1">
<vbox flex="1" id="aaj_utilisateurs_01" />
<splitter />
<hbox flex="1">
<vbox id="aaj_utilisateurs_02" flex="1" />
<spacer flex="1" />
<vbox flex="5">
<vbox id="vb_boutons_standards" />
</vbox>
</hbox>
</vbox>
</window>

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