[jdom-interest] Building with Namespaces

[Steve Beech]

All,

I have the following doc and need to get at the content in the
'myThirdElement' element

<?xml version="1.0" encoding="UTF-8"?>

<myRootElement xmlns="http://www.myserver/mynamespace"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.myserver/myxsinamespace
http://www.myserver/schemas/myxsinamespace.xsd">
  
	<xy:mySecondElement xmlns:xy="http://www.myserver/anothernamespace"
xsi:schemaLocation="http://www.myserver/anotherxsinamespace
http://www.myserver/schemas/anotherxsinamespace.xsd">

		<xy:myThirdElement>This is the info I need to get
at</xy:myThirdElement>

  	</xy:mySecondElement>

</myRootElement>

I've tried the following code (and variations) but cannot get it to work. 

SAXBuilder builder = new SAXBuilder("org.apache.xerces.parsers.SAXParser",
true);
builder.setFeature ("http://xml.org/sax/features/validation", true);
builder.setFeature ("http://apache.org/xml/features/validation/schema",
true);
builder.setFeature("http://xml.org/sax/features/namespaces", true);
Document responseDoc = builder.build(new StringReader(rmresponse));
Element resroot = responseDoc.getRootElement();
Element second = resroot.getChild("mySecondElement");
Namespace xy = second.getNamespace();
Element third = second.getChild("myThirdElement");
String z = third.getText();
System.out.println("Content string: "+z);

I always end up with a NulPointerException
			
Can anyone advise me where I'm going wrong or how I get hold of the element
?

Cheers,

Steve