Making a Legend/Key in GraphViz

Question

I’d like to include a legend or key in my GraphViz diagram. I’m having trouble figuring out what code to use, though. I also want to put it in a corner, but the only coord I

Answer 1

After trying several ways of embedding a key within the main graphviz image, I've decided that for me, it makes more sense to simply put the legend into its own, separate dot file, render it as it's own, separate, image, and then display the images side-by-side in my documents/pages.

This has a few advantages:

a) The .dot source code is substantially simpler. b) It's very easy to change the rankdir of the legend graph to display the nodes above one another, or side-by-side, to produce a key that either sits to the right of the main image, or below it. c) No leaking of things like rank positions from the main graph into the legend.

For example: