bolection moulding refers to a way to suspend a panel in a frame without the use of a dato slot. Using a simple moulding to retain the panel inside the frame. Sometimes moulding is pin-nailed to both sides, sometimes only one. In the case of the one sided bolection, the panel is held against a rabbet. The type of mouldings used are usually rather simple. think cove, ogee, or even just slim rectangular ripps with the edge rounded over a little. I always try to let a solid wood panel float; which means pin nail the moldings to the frame, not the panel.