sc:::sc_edge returns the unique edges, from which the nodes are derived
still need sc_arc to rebuild the arcs themselves from the unique-edge paths for each ring
It's not obvious yet what these functions apply to, probably always only to the PRIMITIVE model directly, since the unique IDs need to be kept in synch.
sc_node returns the nodes
sc:::sc_edge returns the unique edges, from which the nodes are derived
still need sc_arc to rebuild the arcs themselves from the unique-edge paths for each ring
It's not obvious yet what these functions apply to, probably always only to the PRIMITIVE model directly, since the unique IDs need to be kept in synch.