code: public XObject getLocalVariable(int index, int frame)
            throws TransformerException
    {
  
      index += frame;
  
      XObject val = _stackFrames[index];
  
      return val;
    }
docs: Get a local variable or parameter in the current stack frame.
  
  
  @param index Local variable index relative to the given
  frame bottom.
  NEEDSDOC @param frame
  
  @return The value of the variable.
  
  @throws TransformerException