- addChild :: P3DRootNode -> Node -> ()
- getChild :: P3DRootNode -> [Node]
- remChild :: P3DRootNode -> Node -> ()
+ addChild :: P3DRootNode -> Node -> <Proc> ()
+ getChild :: P3DRootNode -> <Proc> [Node]
+ remChild :: P3DRootNode -> Node -> <Proc> ()