So, what does it do? I'm guessing it has something to do with dialog.

It allows me to easily set up conversations between the player and people around him.

Thats cool, especially if it speeds up process on the game.

BUT!

Are you going to hang out with me at Brickfiesta in Austin?!

A digraph, eh? Quick! Someone use Dijkstra's Shortest Path Algorithm so we can start speed-running through the game!

BUT!

 

Are you going to hang out with me at Brickfiesta in Austin?!

We'll see. I'd certainly like to.