(PECL gender >= 0.6.0)
Gender\Gender::IS_FEMALE
Gender\Gender::IS_MOSTLY_FEMALE
Gender\Gender::IS_MALE
Gender\Gender::IS_MOSTLY_MALE
Gender\Gender::IS_UNISEX_NAME
Gender\Gender::IS_A_COUPLE
Gender\Gender::NAME_NOT_FOUND
Gender\Gender::ERROR_IN_NAME
Gender\Gender::ANY_COUNTRY
Gender\Gender::BRITAIN
Gender\Gender::IRELAND
Gender\Gender::USA
Gender\Gender::SPAIN
Gender\Gender::PORTUGAL
Gender\Gender::ITALY
Gender\Gender::MALTA
Gender\Gender::FRANCE
Gender\Gender::BELGIUM
Gender\Gender::LUXEMBOURG
Gender\Gender::NETHERLANDS
Gender\Gender::GERMANY
Gender\Gender::EAST_FRISIA
Gender\Gender::AUSTRIA
Gender\Gender::SWISS
Gender\Gender::ICELAND
Gender\Gender::DENMARK
Gender\Gender::NORWAY
Gender\Gender::SWEDEN
Gender\Gender::FINLAND
Gender\Gender::ESTONIA
Gender\Gender::LATVIA
Gender\Gender::LITHUANIA
Gender\Gender::POLAND
Gender\Gender::CZECH_REP
Gender\Gender::SLOVAKIA
Gender\Gender::HUNGARY
Gender\Gender::ROMANIA
Gender\Gender::BULGARIA
Gender\Gender::BOSNIA
Gender\Gender::CROATIA
Gender\Gender::KOSOVO
Gender\Gender::MACEDONIA
Gender\Gender::MONTENEGRO
Gender\Gender::SERBIA
Gender\Gender::SLOVENIA
Gender\Gender::ALBANIA
Gender\Gender::GREECE
Gender\Gender::RUSSIA
Gender\Gender::BELARUS
Gender\Gender::MOLDOVA
Gender\Gender::UKRAINE
Gender\Gender::ARMENIA
Gender\Gender::AZERBAIJAN
Gender\Gender::GEORGIA
Gender\Gender::KAZAKH_UZBEK
Gender\Gender::TURKEY
Gender\Gender::ARABIA
Gender\Gender::ISRAEL
Gender\Gender::CHINA
Gender\Gender::INDIA
Gender\Gender::JAPAN
Gender\Gender::KOREA