Prevalent untyped network = graph database
Appendix C.3 "Notes on Network Data Models" in Marius's thesis (2013) includes a definition of the network model implemented in Mneson [https://repositorio-aberto.up.pt/bitstream/10216/117068/2/300387.pdf]
See also stuff in this here github repository in Docs_2005
See also [https://web.archive.org/web/20070625173813/http://www.liacc.up.pt/~maa/mneson/]
To be improved/continued...