The structures of dot language

The set of components of the graphviz dot notation endeavouring to follow comparatively close to the language notation

Description:

    strict digraph t {           <= graph
        aa[color=green]          <= node aa and attributes in [..]
        subgraph v {             <= subgraph v
	     aa[shape=square]
	     subgraph vv{a2 -> b2}
	     aaa[color=red]
	     aaa -> subgraph { d -> aaa}  <= subgraph id is anon
        }
       aa -> be -> d -> aaa       <= type of the edge is chain
   }