Hierarchy of Nouns and metrics in a tree. The tree includes Home at the top, with children Containers and Windows. Containers includes children Closets and Cupboards. Closets includes children Bedrooms and Halls. Bedrooms includes children BR1 and BR2. Bedroom BR1 includes children of type myContainer C1 and C2. Bedroom BR2 includes children of type myContainer C1 and C2.