If you mean with a Graph language, a complex data structure language, you might have a look at https://github.com/FransFaase/DataLang https://github.com/FransFa

If you mean with a Graph language, a complex data structure language, you might have a look at https://github.com/FransFaase/DataLang https://github.com/FransFaase/DataLang which gives some ideas about modelling complex data structures and where I talk about the different kind of reference that you might want in such a language.