kajna gismu

x₁ is a shelf/counter/bar in/on/attached to supporting object x₂, for purpose x₃.

In notes:

balni: x₁ is a balcony/overhang/ledge/shelf of building/structure x₂.
ckukajna: k₁ is a bookshelf attached to k₂.
kajnyta'e: t₁=k₂ is a cupboard for storing t₂, made of t₃, with shelves k₁.
samtcikajna: k₁ is a toolbar of k₂=t₁ (icons/programs) for purpose k₃=t₂=s₂.
selkajna: x₁ is a supporting object for shelf/counter/bar x₂ for purpose x₃