following Jakarta XML Binding API calls.
 <pre><code>
 LetterBody lb = ObjectFactory.createLetterBody();
 JAXBElement&lt;LetterBody&gt; lbe = ObjectFactory.createLetterBody(lb);
 List gcl = lb.getContent();  //add mixed content to general content property.
 gcl.add("Dear Mr.");  // add text information item as a String.
 
 // add child element information item
 gcl.add(ObjectFactory.createLetterBodyName("Robert Smith"));
 gcl.add("Your order of "); // add text information item as a String
 
 // add children