Nestsets association: element / vertex

[mclarsen]

Is there a reason/use case to allow both? I feel like they both specify the same thing, and by allowing both, it increases the processing and validation code needed. For example, I would need to globally validate that all are either vertex or element to make sure things make sense.

[cyrush]

@nselliott for nesting, I think we expect element associated metadata? (Correct me if I am wrong :-) Any reason to not make that the only path for now?

[nselliott]

@cyrush I recall that our original discussions envisioned allowing both, but element is the only one that is useful for my purposes, so that's fine if it make everything easier.

[mclarsen]

the association should still be present for clarity, but only one valid value.