Stored Procedures

Is it possible to write a stored procedure which takes a struct as a
parameter?  I'd like to be able to pass in some info via a struct &
return some info via another struct something like this:

struct in_struct {
   integer i, j;
}

struct out_struct {
   integer k;
    char p;
}

create function myfunc(in_struct, out_struct) .....

Any comments?  From what I've read today, it doesn't look like I can do
this!

I'd appreciate any help.

Wendy (wendy@cs.queensu.ca)