* ''no doubling'' - there should be no doubling, i.e. the same concept appearing in multiple taxonomies. For instance why adding ''frozen pizzas'' as a new category, when ''frozen'' is already available as a label and ''pizzas'' as a category. | * ''no doubling'' - there should be no doubling, i.e. the same concept appearing in multiple taxonomies. For instance why adding ''frozen pizzas'' as a new category, when ''frozen'' is already available as a label and ''pizzas'' as a category. |