Java: Adding a Element under an Element (or Converting a Element to a Node)

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When using Document a Element can only be appended with a Node, but what if we have a Element ?

Easy, Element extends Node so just pass the Element along and all is well

import org.w3c.dom.Document;
import org.w3c.dom.Element;
 
Document doc;
Element newElement;
Element oldElement; //code to find that
newElement = doc.createElement("tag");
oldElement.appendChild(newElement);