+-----------------+       +-------------+       +--------+
|RDF extension    | ----> |  RDF model  | <---- |RDF ext.|
+-----------------+       +-------------+       +--------+ +--------+
|Application 1    |       |             |       |App 2   | |App 3   |
|                 |       | Semantic    |       |        | |        |
|                 |       | Composition |       |        | |        |
+-----------------+       | Manager     |       +--------+ +--------+
                          |             |
                          +-------------+
         ^                       ^                   ^          ^
         |                       |                   |          |
         v                       v                   v          v
+--------+--------+       +-------------+       +--------+ +--------+
|Window 1|Window 2|       |   Screen    |       |Window 3| |Window 4|
+--------+--------+-------+-------------+-------+--------+-+--------+
|                         | XComposite  |                           |
|                         | extension   |                           |
|              X server   +-------------+                           |
|                                                                   |
+-------------------------------------------------------------------+