vardag

type VarDAG interface {
	AddVariable(s string, v *VariableContext) error
	VarExists(s string) bool
	GetVarInfo(s string) *VariableContext
	//GetVertices() map[string]*OutputContext
	//GetReferenceInfo(s string) (*OutputContext, error)
	Print()
}

type VariableContext struct {
	VertexName      string // name of the vertex
	OutputVertex    string // used for validation
	BlockIndex      int    // used for validation and connectivity
	BlockVertexName string // used for validation and connectivity
}