I used graphviz dot program to create https://github.com/maksle/xslt-dependencies (xslt 1.0 dependency viewer) for EMACS. I was about to look into this and drop using dot but this also relies on an external service. Nothing wrong with this or dot though, I just thought it would be cool to be entirely self contained in EMACS. It was surprisingly easy to create a nice node graph with dot though.