IndexedLineSet { 
      eventIn       MFInt32 set_colorIndex
      eventIn       MFInt32 set_coordIndex
      exposedField  SFNode  color             NULL
      exposedField  SFNode  coord             NULL
      field         MFInt32 colorIndex        []     # [-1,)
      field         SFBool  colorPerVertex    TRUE
      field         MFInt32 coordIndex        []     # [-1,)
    }