exportProperty(properties, helper.getJcrName("jcr:primaryType"));
exportProperty(properties, helper.getJcrName("jcr:mixinTypes"));
exportProperty(properties, helper.getJcrName("jcr:uuid"));
// serialize remaining properties
Iterator iterator = properties.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry entry = (Map.Entry) iterator.next();
String name = (String) entry.getKey();
exportProperty(name, (Property) entry.getValue());
}