Browse through XML tags using QDomElement

I have to parse xml file's with the following format:

<FirstTag>
    <SecondTag>
        <Attribute value="hello"/> 
    </SecondTag>
</FirstTag>

Now this is what I have:

QDomNode n = domElem.firstChild();
while(!n.isNull()){
  QDomElement e = n.toElement();
  if(!e.isNull()){
    if(e.tagName() == "FirstTag"){
      //secondtag???
    }
  }
n = n.nextSibling();
}

Now to my actual question: I want to access an attribute from SecondTag, how can I access that, because its a sub tag from FirstTag I cant access it in my current loop.