/at_impl.hpp/1.1/Mon Mar 19 19:03:40 2007//
/begin_impl.hpp/1.2/Fri Mar  2 10:44:12 2007//
/end_impl.hpp/1.2/Fri Mar  2 10:44:12 2007//
/value_at_impl.hpp/1.1/Mon Mar 19 19:03:40 2007//
D
