VRML Objects: Can they be flipped around an axis?

Hello,

I have what I hope is a simple question. I am trying to create a "mirror image" of a VRML graphic, but cannot find any way of achieving this. I know a Transform node would allow me to rotate the object around any of the three axes, but this would only leave me with the same object facing the other way. I am looking to actually change the coordinates of my model. Can anyone help?

Many thanks,

Donald