JSFiddle - React, Tailwind, and code Playground

HTML

<xml> <item>
        <id>3ac0daff-51c7-40f2-9396-e0c6adf50858</id>
        <published>2014-12-09T11:27:43.000Z</published>
        <updated>2014-12-09T11:27:43.000Z</updated>
       <ex:relatedid>7fa16377-3382-4ad9-ac52-7ee139e7d9ce</relatedid></xml>

JavaScript

$('xml').find('item').each(function () {

          //works
          var id = $(this).find('id').text();

          //doesn't work
          var ex = $(this).find('ex\\:relatedid').text();

          console.log(ex);

   });