I'm trying to use graphviz (the dot command-line tool, to be more specific) to generate a SVG layout of a graph. I would like to use my Inkscape-generated SVG files to define node shapes, and I followed the instructions on the graphviz tutorial. I'm outputting SVG so, in theory, this should be easy to do by declaring the shapes as <symbol>s and <use>ing them in the diagram. This e-mail makes me believe that the functionality was implemented, and I just can't figure out how to use it.
I tried having a node's image attribute pointing to the custom shape SVG file. I also tried setting the node's shape to custom and pointing the shapefile to the shape SVG. dot complains if I put an invalid file name, and its plugin graph suggests that it can read SVG. I'm guessing that either I'm using the wrong attributes, or there's something wrong with the SVG files that I have tried.
For whatever it's worth, I do have viewBox set on the <svg> attribute.