What Are the Different Ways to Write Block References?

Rome is multiplayer from day one, even though we've been a single player tool. That was actually architecturally some of the hard stuff to figure out. How do I make this thing work as sort of a collaborative real time thing with a graph database? It's thinking about language in a different way than paragraphs or pages. And so things like block references and the ability to build a statement up out of other statements are very important.