Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       artefacta - artefacts
         Product group materials
           Product group fibers
             Product group manufactured fibers (FTC)
               Product group inorganic fibers
                 1 Product metallic fiber (FTC)
                 2.1 Product glass fiber (FTC)
                 2.2 Product ceramic fiber
                 3 Product carbon fiber