add CDATA to xml DOM tree

A CDATA section indicates a block that shouldn’t be parsed. To build a CDATA section just wrap the string with a CDATA object.

import java.io.File;

import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.CDATASection;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class Main {
  public static void main(String[] argv) throws Exception {

    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    factory.setValidating(true);

    factory.setExpandEntityReferences(false);

    Document doc = factory.newDocumentBuilder().parse(new File("filename"));
    Element element = doc.getElementById("key1");

    // Add a CDATA section to the root element
    element = doc.getDocumentElement();
    CDATASection cdata = doc.createCDATASection("data");
    element.appendChild(cdata);

  }
}

If append TextNode directly, it will not appear as CDATA but just plain text.

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