JSFiddle - React, Tailwind, and code Playground
HTML
<div id="res"></div>
JavaScript
chaine='<?xml version="1.0" encoding="utf-8"?>\
<boolean xmlns="http://tempuri.org/">true</boolean>';
xmlDoc=$.parseXML(chaine);
xml = $( xmlDoc );
$('#res').html( xml.find('boolean:eq(0)').html() );