code: public Boolean isValid() {
  
          return addressLine1 != null ||
                  addressLine2 != null ||
                  city != null ||
                  region != null ||
                  postalCode != null ||
                  (country != null && country != CountryIso.NotSpecified);
  
      }
docs: Helper method used internally.
  
  @return True if the {@link Address} details are valid.