code: def unload(self, refobj):
          
          inter = self.get_typ_interface(self.get_typ(refobj))
          ref = self.get_reference(refobj)
          inter.unload(refobj, ref)
docs: Load the given refobject
  
          Unload in this case means, that a reference is stays in the scene
          but it is not in a loaded state.
          So there is a reference, but data is not read from it.
  
          This will call :meth:`ReftypeInterface.unload`.
  
          :param refobj: the refobject
          :type refobj: refobj
          :returns: None
          :rtype: None
          :raises: None