Consider explicitly introducing "dot"

[tbooth]

From @cmeesters:

Idea:

I usually prefer using dot - and demonstrate all possible workflow representations. This way, participants
know how to display and copy&paste "their" DAGs for presentation purposes.

I agree that knowing about the details of the dot program is a very useful thing, but I feel it would be a bit much to introduce it here in this chapter where there is already a lot going on. I'd propose to cover this in additional material that deals with sharing and re-using workflows.