code: public static boolean serialInclude(Utils utils, Element element) {
          if (element == null) {
              return false;
          }
          return utils.isClass(element)
                  ? serialClassInclude(utils, (TypeElement)element)
                  : serialDocInclude(utils, element);
      }
docs: Returns true if the given Element should be included
  in the serialized form.
  
  @param utils the utils object
  @param element the Element object to check for serializability
  @return true if the element should be included in the serial form