I've seen it done in several books and such, so there has to be something that is generating them, or I'm just outright not seeing the tools in Visio, but I was wondering if anyone knows how to make diagrams similar to the ones commonly seen in regards to JSON.
Example Seen Here : http://www.json.org/object.gif
It doesn't have anything to do with json, it just takes a grammar spec and renders it visually.