Extrusion { 
      eventIn MFVec2f    set_crossSection
      eventIn MFRotation set_orientation
      eventIn MFVec2f    set_scale
      eventIn MFVec3f    set_spine
      field   SFBool     beginCap         TRUE
      field   SFBool     ccw              TRUE
      field   SFBool     convex           TRUE
      field   SFFloat    creaseAngle      0                # [0,)
      field   MFVec2f    crossSection     [ 1 1, 1 -1, -1 -1,
                                           -1 1, 1  1 ]    # (-,)
      field   SFBool     endCap           TRUE
      field   MFRotation orientation      0 0 1 0          # [-1,1],(-,)
      field   MFVec2f    scale            1 1              # (0,)
      field   SFBool     solid            TRUE
      field   MFVec3f    spine            [ 0 0 0, 0 1 0 ] # (-,)
    }