Many to Many PL/SQL - how to nest a linking table?

Question

I have two objects that are linked with a many-to-many relations. These two objects have to be nested inside a third object. How should I do ?
I created the type and the table for A, I did the same for B and I finally created the linking table for A and B. How shall I nest this table inside the object C?
Thank you very much for your help as I am new to PL SQL.

Answer 1

I need to create one object called Container. From a modelling perspective, this object has contains all the other objects.
The other objects are items and composed items. The Container contains the items (it is a one-to-many relationships so I created a nested table) but it also contains composed items, which are items linked to parts and this is a many-to-many relationship. How do I do to include the many-to-many in the object container? I included question marks when I did not know. Thank you
CREATE OR REPLACE TYPE Item_type (
Id NUMBER (6),
Type CHAR (7)) ;
CREATE OR REPLACE TYPE Part_type (
Id NUMBER (6),
Type CHAR (7)) ;
CREATE TABLE Item OF Item_type
(Id NOT NULL,
PRIMARY KEY (Id));
CREATE TABLE Part OF Part_type
(Id NOT NULL,
PRIMARY KEY (Id));
CREATE TABLE ComposedItems
(ItemId REF Item_type ,
PartId REF Part_type);
CREATE OR REPLACE TYPE ComposedItems_nested as TABLE OF *????????*
CREATE OR REPLACE TYPE Item_type (
Id NUMBER (6),
Type CHAR (7));
CREATE OR REPLACE TYPE Item_nested as TABLE OF Item_type;
CREATE OR REPLACE TYPE Container_type (
Id NUMBER (6),
Type CHAR (7),
Item Item_nested,
/