Comment 15 for bug 289924

Yes, vertex attributes should be kept, this is being implemented currently. It is theoretically easy, but the attribute handler interface needs an extension, that is why it takes long.

The edge attributes are more problematic, because the projection has edges that correspond to many edges in the original graph. How would you define the edge weights of the edges in the projection graphs? I do not know any natural definition. You can certainly come up with many sensible definitions, but these typically require a very flexible attribute handler. Which we don't have.