SoSFBool(3) on Linux
The text 8c288b00d141, as Debian 6.0 (Squeeze) shipped it.
The SoSFBool class is a container for an SbBool value. This field is used where nodes, engines or other field containers needs to store a boolean on/off or TRUE/FALSE value, like for instance as the 'on' field of the SoPointLight, SoSpotLight and SoDirectionalLight node classes.