Wireframe markup language?

A technical question we need to settle early is in what format should the wireframe of the tree be released (under Creative Commons) so as to allow anyone who wants to render it up for their own uses? We will be paying someone commercially to make up a broadcast version, but want it to be as widely useful as possible. I'll blog more later on chronograms, and of course there would be data associated with each node, but I still think we need feedback from the biology and the graphics communities on what would be best.