digraph

type BasicEdge struct {
	Name     string
	EdgeHead *BasicNode
	EdgeTail *BasicNode
}

type BasicNode struct {
	Name      string
	NodeEdges []Edge
}

type Digraph interface {
	// Nodes provides all the nodes in the graph
	Nodes() []Node

	// Sources provides all the source nodes in the graph
	Sources() []Node

	// Sinks provides all the sink nodes in the graph
	Sinks() []Node

	// Transpose reverses the edge directions and returns
	// a new Digraph
	Transpose() Digraph
}

type Edge interface {
	// Head returns the start point of the Edge
	Head() Node

	// Tail returns the end point of the Edge
	Tail() Node
}

type Node interface {
	// Edges returns the out edges for a given nod
	Edges() []Edge
}