ElevationGrid { 
      eventIn      MFFloat  set_height
      exposedField SFNode   color             NULL
      exposedField SFNode   normal            NULL
      exposedField SFNode   texCoord          NULL
      field        MFFloat  height            []      # (-,)
      field        SFBool   ccw               TRUE
      field        SFBool   colorPerVertex    TRUE
      field        SFFloat  creaseAngle       0       # [0,]
      field        SFBool   normalPerVertex   TRUE
      field        SFBool   solid             TRUE
      field        SFInt32  xDimension        0       # [0,)
      field        SFFloat  xSpacing          1.0     # (0,)
      field        SFInt32  zDimension        0       # [0,)
      field        SFFloat  zSpacing          1.0     # (0,)
    }