The Dot.Kind class
- class Dot.Kind
- The values in this enum can be used to indicate the type of a graph. - The valid values are: - digraph = <Kind.digraph: 0>
- Value indicating that the represented graph has directed edges ->. 
 - graph = <Kind.graph: 1>
- Value indicating that the represented graph has undirected edges –. 
 - subgraph = <Kind.subgraph: 2>
- Value indicating that the represented graph is a subgraph of another Dot object.