libxrdeveloper's documentation
xr_value* xr_call_get_param ( xr_call call,
unsigned int  pos 
)

Get parameter from specified position (counts from 0).

Parameters:
callCall obejct.
posParameter position (counts from 0).
Returns:
Value node or NULL if parameter does not exist.
Warning:
Returned value is still owned by the call object. Don't free it!
Documentation for libxr, Tue Jun 7 2011 18:01:53.