Oracle 11g Release 2

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declare
  type t_addr_lines is varray(4) of varchar2(60);
  type t_addr_entry is table of t_addr_lines index by varchar2(10);

type t_student    is record
  (
    last_name      varchar2(20),
    first_name     varchar2(20),
    l_addr_entry   t_addr_entry
  );

type t_students is table of t_student;

l_students t_students;

-- index for address entries
  i_addr varchar2(10);

begin
  l_students := t_students();

l_students.extend();
  -- explicit carray entry number 
  l_students(1).first_name := 'Bruce';
  l_students(1).last_name := 'Wayne';
  l_students(1).l_addr_entry('Home') := t_addr_lines('1007 Mountain Drive', 'Gotham');
  l_students(1).l_addr_entry('Work') := t_addr_lines('The Batcave', '1007 Mountain Drive', 'Gotham');

l_students.extend();
  -- last entry in varray
  l_students(l_students.last).first_name := 'Clark';
  l_students(l_students.last).last_name := 'Kent';
  l_students(l_students.last).l_addr_entry('Work') := t_addr_lines('The Daily Planet', 'Metropolis');

for i_stud in l_students.first..l_students.last
  loop
    dbms_output.put_line('Student: '
      || l_students(i_stud).last_name ||', '|| l_students(i_stud).first_name);

-- get index value of first address table entry
    i_addr := l_students(i_stud).l_addr_entry.first;
    -- loop over addresses starting from that index
    while i_addr is not null
    loop
      dbms_output.put_line('Address (' || i_addr || '):');
      -- loop over lines in this address
      for i_line in l_students(i_stud).l_addr_entry(i_addr).first
                  ..l_students(i_stud).l_addr_entry(i_addr).last
      loop
        dbms_output.put_line('  ' || l_students(i_stud).l_addr_entry(i_addr)(i_line));
      end loop;
      i_addr := l_students(i_stud).l_addr_entry.next(i_addr);
    end loop;
  end loop;
end;
/

1 rows affected

dbms_output:
Student: Wayne, Bruce
Address (Home):
  1007 Mountain Drive
  Gotham
Address (Work):
  The Batcave
  1007 Mountain Drive
  Gotham
Student: Kent, Clark
Address (Work):
  The Daily Planet
  Metropolis