Layer                 Example
       +-------------+      +-----------------+      +----------------+
   (4) |   Content   |      |  Configuration  |      |  Notification  |
       |             |      |      data       |      |      data      |
       +-------------+      +-----------------+      +----------------+
              |                       |                      |
       +-------------+      +-----------------+              |
   (3) | Operations  |      |  <edit-config>  |              |
       |             |      |                 |              |
       +-------------+      +-----------------+              |
              |                       |                      |
       +-------------+      +-----------------+      +----------------+
   (2) |  Messages   |      |     <rpc>,      |      | <notification> |
       |             |      |   <rpc-reply>   |      |                |
       +-------------+      +-----------------+      +----------------+
              |                       |                      |
       +-------------+      +-----------------------------------------+
   (1) |   Secure    |      |               SSH, TLS, ...             |
       |  Transport  |      |                                         |
       +-------------+      +-----------------------------------------+