Shame it fails for the trap of natural language ambiguity. So on the front page I see "England -> capital -> London" and at a glance I thought the capital (as in money) flows from England and is accumulated in London.
I agree in general (and it's the fault of freely user-definable keys/attribute) - but that's not a great example, since the arrow aren't read as a direction of flow.
Perhaps that reveals that a forward slash might be a better separator though - like a URI.
Perhaps that reveals that a forward slash might be a better separator though - like a URI.