Hallway
The internal circulation volume of a dwelling at entrance level, wider and more furnished than a `corridor` and typically the space rooms open off.
hall
The ISA edge holds on the load-bearing half of `corridor`: passage between other spaces. The parent's proportion clause - longer than it is wide - describes its central case rather than stating a necessary condition, and a generous furnished hall is still circulation. If that clause is ever tightened into a test, this edge comes out with it.