Work with graphapi?

While the two modules are quite different, http://drupal.org/project/graphapi shares a fair bit of overlap in the core graph processing with this module. It would be good to reduce duplication in this area, and combine resources for maintenance.

I was wondering if graphviz_filter might be able to be split up into components that could be plugged-in to something like graphapi? ie. one module is the input format that just creates a graphapi graph, and then another graphviz module that takes a graphapi graph and renders it?

Even if this doesn't happen, it would definitely be good to get some discussion going between the two modules.