Copy nodes subtree from one DOM document to another

package com.javacodegeeks.snippets.core;

import java.io.File;
import java.io.FileInputStream;
import java.io.StringWriter;
import java.io.Writer;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class CopyNodesSubtreeFromOneDOMDocumentToAnother {
 
 public static void main(String[] args) throws Exception {
  
  DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
  dbf.setValidating(false);
  DocumentBuilder db = dbf.newDocumentBuilder();
  
  Document doc1 = db.parse(new FileInputStream(new File("in1.xml")));
  Document doc2 = db.parse(new FileInputStream(new File("in2.xml")));
  
  System.out.println("Before Copy...");
  prettyPrint(doc2);
  
  NodeList list = doc1.getElementsByTagName("channel");
  Element element = (Element) list.item(0);

  // Imports a node from another document to this document, without altering 
     // or removing the source node from the original document
  Node copiedNode = doc2.importNode(element, true);

  // Adds the node to the end of the list of children of this node
  doc2.getDocumentElement().appendChild(copiedNode);
  
  System.out.println("After Copy...");
  prettyPrint(doc2);
  
 }
 
 public static final void prettyPrint(Document xml) throws Exception {
  Transformer tf = TransformerFactory.newInstance().newTransformer();
  tf.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
  tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
  tf.setOutputProperty(OutputKeys.INDENT, "yes");
  Writer out = new StringWriter();
  tf.transform(new DOMSource(xml), new StreamResult(out));
  System.out.println(out.toString());
 }

}

input:

<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0">
 <channel>
  <title>Java Tutorials and Examples 1</title>
  <language>en-us</language>
  <item>
   <title><![CDATA[Java Tutorials 1]]></title>
   <link>http://www.javacodegeeks.com/</link>
  </item>
  <item>
   <title><![CDATA[Java Examples 1]]></title>
   <link>http://examples.javacodegeeks.com/</link>
  </item>
 </channel>
</rss>