An interface provides a level of abstraction between the structure of a database system and application programs which access that system. The valve shaft assembly includes a first shaft portion and a second shaft portion. The wall elements, which form the side wall of the crucible, have cooling channels, through which a cooling fluid can be conducted, so that the glass melt solidifies on the side wall and forms a skull layer. The first electronic device is electrically connected to the base unit. The operation further includes determining whether the result set includes sensitive data based on predefined sensitivity attributes associated with data in the result set. The die mounting area includes a frame with an opening formed therein, a die paddle, and a descending portion which connects the die paddle to the frame.