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                    Grouping nodes help to organize the scene graph, can establish relative coordinate systems,
                    and can contain most other kinds of X3D nodes.
     
                 Grouping nodes include the 
                 Anchor,
                 Billboard,
                 Collision,
                 Group,
                 StaticGroup,
                 Switch
                 and
                 Transform
                 nodes.
                 The 
                 Inline
                 node is also similar since it adds nodes into the current scene that loaded from another X3D scene, retrieved
                 via a local or online url address.
     
                 The supporting
                 Chapter 3 slideset
                 and course videos
                (NPS,
                 YouTube)
                 for X3D for Web Authors are available online via
                 X3dGraphics.com.
     
                 Also available:
                 X3D Scene Authoring Hints
                 for
                 Coordinate Systems,
                 Inline Scenes,
                 Scale Factors
                 and
                 URL Links.
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