From: Martin Vales Date: 2008-04-24T18:40:04+09:00 Subject: inverse OOP Hi: I have always had a doubt about OOP. Usually we have a parent and several child, but what happen if we need the inverse system. for example DBI/DBD APIs.?? I need build map proyections and i want and intermediate API for all proyections clases. All map proyections have the same methods (geodetic_to_projected and projected_to_geodetic) Regards. -- Posted via http://www.ruby-forum.com/.