Comment 4 for bug 1012434

As for GraphML, we can maybe check how other software tools extended the schema, and emulate them.

As for serialization. OK, this is better. So effectively this would allow the user to specify how exactly they want to save the complex attributes, right? If yes, then we can do this.

I still think, however, that it is not as important, as the other issue, i.e. the GML and GraphML complex attributes that can be used by other software (without tweaking with serialization). In Python you can always pickle, and in R you can save/load, you saving/reloading graphs with complex attributes is not a problem.

If it is possible to solve the GML/GraphML stuff as a special case of serialization, that would be probably the best. If you know what I mean.