pma/js/dist/transformations/xml_editor.js

/**
 * XML editor plugin
 *
 * @package PhpMyAdmin
 */
AJAX.registerOnload('transformations/xml_editor.js', function () {
  $('textarea.transform_xml_editor').each(function () {
    CodeMirror.fromTextArea(this, {
      lineNumbers: true,
      indentUnit: 4,
      mode: 'application/xml',
      lineWrapping: true
    });
  });
});