How to add pop-out annotations in Graphviz?

I am a newbie learning to use graphviz.

Is it possible to generate interactive pop-out annotations when you move cursor around the graph? For example, hovering a node/edge will pop-out message box showing more information about it.

And if so, how?

Thank you so much for the help.

Solution

Depending on the output format, there are some possibilities:

You may create a png image and an image map and serve it as a html page. The world of html and javascript offers endless possibilities to make this interactive, use popout messages, etc.
If you prefer svg, some information is already included in the output as <title>, and again, if served within a browser, javascript may prove useful to enrich the output (not sure if it's possible to use existing svg with raphaeljs, but it sure shows nicely what's possible with svg + javascript).
You may simply have graphviz render the positions of all nodes and parse it's output to present it in your custom application