PECL and Class Organization

i had a little time and a few braincells to spare, so i ventured to do some extension programming. given that i intend to submit it to PECL, i had some questions about organization. the project aims to implement PHP classes feature (if not interface) compatible java.util.date/timezone/calendar etc. the question, however, i how should the classes be organized. for instance, take the calendar classes GregorianCalendar (extends Calendar) HebrewCalendar & IslamicCalendar(extend Calendar) BuddhistCalendar (extends Gregorian) so, how would we structure this : a) Flat $tz = new TimeZone("EST"); $cal = new GregorianCalendar($timestamp, $tz); b) Nested $tz = new Date::TimeZone("EST"); $greg = new Date::Calendar::Gregorian($timestamp,$tz); III) ??? l0t3k