That's a navigable interface, not a discoverable one. This is one of the key differences between a hypermedia style interface and a traditional directory servic

That's a navigable interface, not a discoverable one. This is one of the key differences between a hypermedia style interface and a traditional directory service. Navigable interfaces tend to be easier for people to find what they are looking for, but for automated service discovery, a directory service is far more straight forward.