Error in documentation of PL/SQL on multidimensional holdings?

Hello

It is a small issue, but I think that the following PL/SQL reference 11.2 (http://docs.oracle.com/cd/E11882_01/appdev.112/e25519/composites.htm#BABIBDDG), is to the wrong tables nested data types (and variables created of these types).
Surely, no matter where you see "INDEX BY...» ', it is an associative array. Therefore, ntb1 is an associative array of associative arrays, and ntb2 is an associative array of varrays. Am I wrong?

Thank you
Jason
Example 5–13 Nested Tables of Associative Arrays and Varrays of Strings
DECLARE
  TYPE tb1 IS TABLE OF INTEGER INDEX BY PLS_INTEGER; -- associative arrays
  v4 tb1;
  v5 tb1;
  TYPE ntb1 IS TABLE OF tb1 INDEX BY PLS_INTEGER; -- nested table of
  v2 ntb1; -- associative arrays
  TYPE va1 IS VARRAY(10) OF VARCHAR2(20); -- varray of strings
  v1 va1 := va1('hello', 'world');
  TYPE ntb2 IS TABLE OF va1 INDEX BY PLS_INTEGER; -- nested table of varrays
  v3 ntb2;
BEGIN
  v4(1) := 34; -- populate associative array 
  v4(2) := 46456;
  v4(456) := 343;
  v2(23) := v4; -- populate nested table of associative arrays
  v3(34) := va1(33, 456, 656, 343); -- populate nested table of varrays
  v2(35) := v5; -- assign empty associative array to v2(35)
  v2(35)(2) := 78;
END;
/

>
It is a small issue, but I think that the following PL/SQL reference 11.2 (http://docs.oracle.com/cd/E11882_01/appdev.112/e25519/composites.htm#BABIBDDG), is to the wrong tables nested data types (and variables created of these types).
Surely, no matter where you see "INDEX BY...» ', it is an associative array. Therefore, ntb1 is an associative array of associative arrays, and ntb2 is an associative array of varrays. Am I wrong?
>
Yes - the documentation is wrong on this point.

One of the main differences between an associative array and a nested table is how they are treated after creation if they have not yet been met. The table is considered to be EMPTY, while the nested table is treated as UNITIALIZED.

The doc says so
>
As a database, an associative array:

Is empty (but not zero) until that fill you
. . .
An uninitialized variable nested table is a collection of zero. You must initialize, either by making empty or by assigning a value not NULL.
>
You can see this particular difference with this code example.

DECLARE
  TYPE array_test1 IS table of VARCHAR2(15) index by PLS_INTEGER;
  my_array1 array_test1;

  TYPE nt_test1 IS TABLE OF VARCHAR2(15);  -- nested table type

  my_nt1 nt_test1;
BEGIN
--  dbms_output.put_line('array 1 [' || my_array1(0) || '].');

  dbms_output.put_line('nt 1 [' || my_nt1(0) || '].');

END;

The foregoing will give this exception:
>
ORA-06531: Reference to an uninitialized collection
ORA-06512: at line 11 level
>
If "uncomment you" the first line and comment on the second, you will get a different exception:
>
ORA-01403: no data found
ORA-06512: at line 9 level

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