How to create a Stereo Fisheye Camera

I am trying to create a stereo fisheye camera but am unable to do so. The documentation gives examples of how to create them individually, so for example, we define a lens to be fisheye by defining its type as wideanglecamera below.0 0 0.05 0 0 00.10.1 0.1 0.10.1 0.1 0.11.0473202400.1100gnomonicaltrue1.5707512130 Similarly, we use the type="multicamera" for stereo cameras. But how can we create a stereo fisheye camera, i.e. a stereo camera with fisheye lenses? I've tried ... But that gives me an Error parsing XML in file when trying to parse the sdf file. Thanks!