The main graph is the graph user will mostly interact with. It contains the RGGRoot and Axiom. By default all objects insertion, and queries are applied to element of that graph.
Its name is given by the constant: GraphManager.MAIN_GRAPH.
All children of a Node can be iterated over with:
for (Edge e = n.getFirstEdge (); e != null; e = e.getNext (n)) { }
It minimal form (after being reinitialized in an empty project) is: