Xml parsing from string

[Chris Howe]

In the Google Checkout integration, I'm needing to parse the following
xml string...

<?xml version="1.0" encoding="UTF-8"?><checkout-redirect
xmlns="http://checkout.google.com/schema/2";
serial-number="ec09382f-c1b3-4ab2-8090-35906e3918e6">  
<redirect-url>
https://sandbox.google.com/checkout/view/buy?o=shoppingcart&amp;shoppingcart=dgfi89u2398
</redirect-url>
</checkout-redirect>

I have it contained as a string.  How do I get the value of the
redirect-url
(https://sandbox.google.com/checkout/view/buy?o=shoppingcart&amp;shoppingcart=dgfi89u2398)?


I've tried the following:
=============
response = <?xml version ... (from above)
document = org.ofbiz.base.util.UtilXml.readXmlDocument(response);
rootElement = document.getRootElement;
childList = org.ofbiz.base.util.UtilXml.childElementList(rootElement);
childListIter = childList.iterator();
while (childListIter.hasNext()){
   child = childListIter.next();
   nodeName = child.getNodeName();
   if ("call-map-processor".equals(nodeName)){
      redirect = org.ofbiz.base.util.UtilXml.elementValue(child);
   }

==============

document ends up returning [#document: null]

any ideas would greatly be appreciated.  Thanks!
-Chris