the sum value. SOS.

hello i have the bellow xml.
i am tring to load the sum of some nodes but i cannot load it.

i have some nodes and i wnat to load the sum value:
XML:
....
- <puntuaciones>
- <puntuacion>
  <puntuacion_valor>8</puntuacion_valor> 
 </puntuacion>
- <puntuacion>
  <puntuacion_valor>33</puntuacion_valor> 
 </puntuacion>
- <puntuacion>
  <puntuacion_valor>28</puntuacion_valor> 
 </puntuacion>
 </puntuaciones>..
...

how can i load the sum of the <puntuacion_valor> nodes?

thanks


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