We need a way for a node to state typed non-linear relationships to other nodes.
Use cases:
A player proposes a synthesis of two solutions. This synthesis should credit the originals, which need to remain visible. Some credit goes to their respective authors. (Failure to specify another guild's good idea should be penalized. The question of assigning fair relative credit is a quest unto itself.)
In turn-based play, two guilds propose similar nodes which have to be unified. (Then the original nodes should be hidden in the tree, visible when the unified node is presented.)
We need a way for a node to state typed non-linear relationships to other nodes. Use cases: