eZ Components - Tree
~~~~~~~~~~~~~~~~~~~~

+----------------------------+-----------------------------------------------------------------------+
| Operation                  | Back-ends                                                             |
|                            +----------------------+-------------------------+----------------------+
|                            | Parent Child         | Nested set              | Materialized Path    |
+============================+======================+=========================+======================+
| addChild()                 | *Simple operation.*  | Possibly long, as on    | *Simple operation.*  |
|                            |                      | average the left and    |                      |
|                            |                      | right values of half of |                      |
|                            |                      | the nodes in the tree   |                      |
|                            |                      | have to be updated.     |                      |
+----------------------------+----------------------+-------------------------+----------------------+