func (g *Graph) GetDefinition() GraphDefinition {
	if g == nil || g.Definition == nil {
		return GraphDefinition{}
	}
	return *g.Definition
}
func (g *Graph) GetDefinition() GraphDefinition {
	if g == nil || g.Definition == nil {
		return GraphDefinition{}
	}
	return *g.Definition
}
// GetDefinition returns the Definition field if non-nil, zero value otherwise.