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Emitting a DOCTYPE Declaration When Writing an XML File from a DOM Document

import java.io.File; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.OutputKeys; import javax.xml.transform.Result; import javax.xml.transform.Source; 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; 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"));     Transformer xformer = TransformerFactory.newInstance().newTransformer();     xformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "publicId");     xformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, "systemId");     Source source = new DOMSource(doc);     Result result = new StreamResult(new File("outfilename.xml"));     xformer.transform(source, result);   } }