E4X to DOM

xmlToDOM.js

var XHTML = new Namespace("xhtml", "http://www.w3.org/1999/xhtml");
function xmlToDom (xml, xmlns) {
  XML.prettyPringing = false;
  XML.ignoreWhitespace = true;
  var doc = (new DOMParser).parseFromString(
    <root xmlns={xmlns || XHTML}>{xml}</root>.toXMLString(),
    "application/xml"
  );
  var imported = document.importNode(doc.documentElement, true);
  var range = document.createRange();
  range.selectNodeContents(imported);
  var fragment = range.extractContents();
  range.detach();
  return fragment.childNodes.length > 1 ? fragment : fragment.firstChild;
}