Java: Most efficient method to iterate over all elements in a org.w3c.dom.Document?

What is the most efficient way to iterate through all DOM elements in Java?

Something like this but for every single DOM elements on current org.w3c.dom.Document?

for(Node childNode = node.getFirstChild(); childNode!=null;){
    Node nextChild = childNode.getNextSibling();
    // Do something with childNode, including move or delete...
    childNode = nextChild;
}