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type Attrs map[string]string

type Cluster struct {
	ID       string
	Clusters map[string]*Cluster
	Nodes    []*Node
	Attrs    Attrs
}

type Edge struct {
	From  string
	To    string
	Attrs Attrs
}

type Graph struct {
	Title    string
	Attrs    Attrs
	Clusters map[string]*Cluster
	Nodes    []*Node
	Edges    []*Edge
	Options  map[string]string
	Ranks    []*Rank
}

type Node struct {
	ID    string
	Attrs Attrs
}

type Rank struct {
	Name  string
	Nodes []string
}