PathFieldSimple simple = new PathFieldSimple();
simple.setSimpleStringContent("simpleStringContent");
fieldMapComplex.setContent(simple);
Parser parser =new Parser();
String xml = parser.encode(fieldMapComplex);
GregorianCalendar gregorianCalendar = (GregorianCalendar)GregorianCalendar.getInstance();
gregorianCalendar.setTime(date);
XMLGregorianCalendar xmlGregorianCalendar = DatatypeFactory.newInstance().newXMLGregorianCalendar(gregorianCalendar);