Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       artefacta - artefacts
         Product group materials
           Product group textile materials
             Product group animal textiles
               1 Product silk (thread)
               1.n Product silk (fabric)
               2.1 Product mohair (yarn)
               2.1.n Product mohair (fabric)
               2.2 Product wool (yarn)
               2.2.n1 Product flannel (fabric)
               2.2.n2 Product tweed (fabric)
               2.3 Product felt (fabric)