SQL & PL/SQL :: How To Select From Nested Collection In A Ref Cursor

I've create two types:

create or replace type VAL_REC as object
(WAARDE number(20,5) ) ;

create or replace type VAL_TAB is VARRAY(200) of VALREC ;

create or replace type WSN_REC as object
( START_DATE date
, END_DATE date
, DATA VAL_TAB) ;

create or replace type WSN_TAB as table of WSN_REC ;

In a PL/SQL table collecton WSN_TAB is filled. Now I want to create a query (ref cursor) that gives the result:

START_DATE END_DATE WAARDE(1) WAARDE(2) WAARDE(3) etc.
2010-08-15 2010-08-16 20 20 40
2010-08-16 2010-08-17 23 45 40