elements

type Edge struct {
	Class       string                 `json:"class,omitempty" bson:"class,omitempty" yaml:"class,omitempty" hcl:"class,omitempty"`
	Group       string                 `json:"group" bson:"group" yaml:"group" hcl:"group"`
	Source      string                 `json:"source" bson:"source" yaml:"source" hcl:"source"`
	Destination string                 `json:"destination" bson:"destination" yaml:"destination" hcl:"destination"`
	Directed    bool                   `json:"directed" bson:"directed" yaml:"directed" hcl:"directed"`
	Properties  map[string]interface{} `json:"properties" bson:"properties" yaml:"properties" hcl:"properties"`
}

type Element interface {
	GetClass() string
	GetGroup() string
	GetProperties() map[string]interface{}
	SetProperty(name string, value interface{})
}

type Entity struct {
	Class      string                 `json:"class,omitempty" bson:"class,omitempty" yaml:"class,omitempty" hcl:"class,omitempty"`
	Group      string                 `json:"group" bson:"group" yaml:"group" hcl:"group"`
	Vertex     string                 `json:"vertex" bson:"vertex" yaml:"vertex" hcl:"group"`
	Properties map[string]interface{} `json:"properties" bson:"properties" yaml:"properties" hcl:"properties"`
}