On 19/12/2012, at 21:19 , hersala wrote:

> Dear users:
> Can someone give me a hint about how I can extract (using a polygon .shp) 
> height values from a DEM and assigning zero or any codified value to the 
> nodes located outside the polygon.
> Thanks in advance.
> Hernán

Could you clip the DEM to the polygon and then vectorise the result?
Both should be in the raster menu.

-ramon.
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