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
}