// a class dictionary graph for simple class dictionary graphs
// note that the syntax is not the standard one

CdGraph = <adjs> List(Adjacency).
Adjacency =
  <source> Vertex
  <ns> Neighbors.
Neighbors : C | A *common* <constructNs> List(Vertex).
A = ":" <alternatNs> List(Vertex).
C = "=".
Vertex = <v> DemIdent.
List(S) ~ "(" {S} ")".