[Gvsig_english] Field calculator::possibility to calculate x/y coordinates?

[Wolfgang Qual]

Hi list,
maybe I am just blind. I searched for a function within the new field 
calculator to create x/y coordinates in a table, but I could not find any. 
*Is* there a possibility to calculate these values (comparable to 
[aShape].getX in Avenue)? Or is there a possibility to do this with a script? 
Any ideas?

Best,
Wolfgang