title: how to write XOM document to XML file with pretty print?
body: <p>I used the following code to write the xml</p>
  
  <pre><code>    import nu.xom.Document;
      import nu.xom.Element;
      import nu.xom.Serializer;
  
      Element root = new Element("ADT");
      root.addNamespaceDeclaration("xsi","http://www.w3.org/2001/XMLSchema");
      root.setNamespaceURI("urn:hl7-org:v3");
  
      Element msh = new Element("MSH", "urn:hl7-org:v3");
      Element msh_1 = new Element("MSH.1", "urn:hl7-org:v3");
      msh_1.appendChild(m.getFieldSeperator());
      Element msh_2 = new Element("MSH.2", "urn:hl7-org:v3");
      msh_2.appendChild(m.getEncodingCharacters());
  
      msh.appendChild(msh_1);
      msh.appendChild(msh_2);
  
      root.appendChild(msh);
      Document document = new Document(root);
      Serializer serializer;
      serializer = new Serializer(System.out, "UTF-8");
      serializer.setIndent(4);
      serializer.write(document);
  </code></pre>
  
  <p>That prints my xml document on the console with pretty print. If anyone can help me to get the same same to an xml file? Thank you </p>