pres_params = 
{
  int length;

  color = 
  {
    int length;

    pp_color = 
    {
      ulong id;
      rgb color;
    };

    pp_color pp;
  };

  font = 
  {
    int length;

    pp_font = 
    {
      ulong id;
      int font_size;
      string font_name;
    };

    pp_font pp;
  };

  color _; font _;
};
