A structure as named layers, for searching use.
OLD type of tree:
ROOT
+---page
| +---news
| | +---recent
| | | +---newB
| | +---hot
| | +---newA
| +---games
| +---zelda
+---users
| +---space
+---admin
+---users
NEW type of tree:
ROOT
├─ page
│ ├─ news
│ │ ├─ recent
│ │ │ └─ newB
│ │ └─ hot
│ │ └─ newA
│ └─ games
│ └─ zelda
├─ users
│ └─ space
└─ admin
└─ users