oh_countries            Get list of countries supported by OpenHolidays
oh_languages            Get supported languages
oh_public_holidays      Get public holidays for a given country and
                        time period
oh_public_holidays_by_date
                        Get public holidays for a specific date for all
                        countries
oh_school_holidays      Get school holidays for a given country and
                        time period
oh_school_holidays_by_date
                        Get school holidays for a specific date for all
                        countries
oh_stat_public_holidays
                        Reads statistical data about stored holidays
oh_subdivisions         Get subdivisions for a given country
