SoBaseKit(3) on Linux
The text 05c25bb17c66, as Debian 8 (Jessie) shipped it.
The SoBaseKit class is the toplevel superclass for nodekits. Node kits are collections of nodes and other node kits (from here on node kits which are part of some other node kit, will only be referred to as nodes or parts, see catalogs and parts), organized in a way that is convenient for its use. A node kit inherits SoNode and can thus be inserted into a scenegraph as any other node.