NodeNetworkSets are specific types of Graphs#1.3.6.1.4.1.33097.1.0.14 that only include one or more NodeNetwork(s)#1.3.6.1.4.1.33097.1.0.12. Note that each NodeNetwork(s)#1.3.6.1.4.1.33097.1.0.12 may have its own attributes (i.e. Acyclic#1.3.6.1.4.1.33097.1.0.12.7 or Directional#1.3.6.1.4.1.33097.1.0.12.6)
The following shows a NodeNetworkSet comprised of two NodeNetworks#1.3.6.1.4.1.33097.1.0.12, one starting with a and one starting with b. Note the starting points are know as UpstreamOriginNodes#1.3.6.1.4.1.33097.1.0.13.1 Note this is not a connected graph!
a → b → c
d → e → f
https://en.wikipedia.org/wiki/Graph_theory
https://medium.com/basecs/a-gentle-introduction-to-graph-theory-77969829ead8