graph: graph serialisation
Created by: kortschak
It would be good to have some standard graph serialisation capacity.
Which would we like to support?
Probably DOT at the very least, but I think at least one of the richer markup languages, probably GraphML since it seems to have the widest compatibility range, though GEXF would probably be nice as well.
In the first instance marshaling support would be the goal, later to add unmarshaling.