code: public boolean isSet(String propName) {
          if (propName.equals("nickName")) {
              return isSetNickName();
          }
          if (propName.equals("street")) {
              return isSetStreet();
          }
          if (propName.equals("city")) {
              return isSetCity();
          }
          if (propName.equals("stateOrProvinceName")) {
              return isSetStateOrProvinceName();
          }
          if (propName.equals("postalCode")) {
              return isSetPostalCode();
          }
          if (propName.equals("countryName")) {
              return isSetCountryName();
          }
          return false;
      }
docs: Returns true if the requested property is set; false, otherwise.
  
  @return
  returned object is {@link boolean }