SoQtObject(3) on Linux
The text a057b5889b5e, as Debian 9 (Stretch) shipped it. The page shows this text now.
The SoQtObject class is the common superclass for all SoQt component classes. The purpose of making this class the superclass of all SoQt device, component and viewer classes is to be able to do run-time type checking of the SoQt objects.