A Triplet_List_Element corresponds to a table of three columns (Code, Name, Period).
| Name | Type | Not Null | Primary Key | Foreign Key | Remarks |
| :——— | :——— | :————- | :—————- | :—————- | :———— |
| id_flexible_element | bigint | X | X | flexible\_element(id_flexible_element) | This is the primary key of the table and also a foreign key on the table flexible_element which is its parent table. |