,-----------------------------------------------. 
 |{{                                             | 
 |-----------------------------------------------| 
 |  component book1 [                            | 
 |  **title** 7 Habits of Highly Effective People| 
 |  **isbn** 978-1982137274                      | 
 |  **author_name** Sean Covey                   | 
 |  ]                                            | 
 |  component book2 [                            | 
 |  **title** 7 Habits of Highly Effective People| 
 |  **isbn** 978-1982137274                      | 
 |  **author_name** Stephen Covey                | 
 |  ]                                            | 
 |                                               | 
 |  component book3 [                            | 
 |  **title** The Power of Habit                 | 
 |  **isbn** 978-0812981605                      | 
 |  **author_name** Charles Duhigg               | 
 |  ]                                            | 
 |}}                                             | 
 |                                               | 
 `-----------------------------------------------' 
                         |                         
                         |                         
                ,-----------------.                
                |group by **isbn**|                
                |-----------------|                
                `-----------------'                
                         |                         
,-------------------------------------------------.
|{{                                               |
|-------------------------------------------------|
|  rectangle "978-1982137274" as 7habits #White { |
|    component book11 [                           |
|    **title** 7 Habits of Highly Effective People|
|    **isbn** 978-1982137274                      |
|    **author_name** Sean Covey                   |
|    ]                                            |
|                                                 |
|    component book12 [                           |
|    **title** 7 Habits of Highly Effective People|
|    **isbn** 978-1982137274                      |
|    **author_name** Stephen Covey                |
|    ]                                            |
|    book11 -[hidden]d- book12                    |
|  }                                              |
|                                                 |
|  rectangle "978-0812981605" as power #White {   |
|    component book13 [                           |
|    **title** The Power of Habit                 |
|    **isbn** 978-0812981605                      |
|    **author_name** Charles Duhigg               |
|    ]                                            |
|  }                                              |
|}}                                               |
|                                                 |
`-------------------------------------------------'
                         |                         
                                                   
          ,----------------------------.           
          |aggregate by **author_name**|           
          |----------------------------|           
          `----------------------------'           
                         |                         
 ,-----------------------------------------------. 
 |{{                                             | 
 |-----------------------------------------------| 
 |  component book111 [                          | 
 |  **title** 7 Habits of Highly Effective People| 
 |  **isbn** 978-1982137274                      | 
 |  **authorNames** [Sean Covey, Stephen Covey]  | 
 |  ]                                            | 
 |  component book121 [                          | 
 |  **title** The Power of Habit                 | 
 |  **isbn** 978-0812981605                      | 
 |  **authorNames** [Charles Duhigg]             | 
 |  ]                                            | 
 |}}                                             | 
 |                                               | 
 `-----------------------------------------------'