code: def cfn_viz(template, parameters={}, outputs={}, out=sys.stdout):
      
      known_sg, open_sg = _analyze_sg(template['Resources'])
      (graph, edges) = _extract_graph(template.get('Description', ''),
                                      template['Resources'], known_sg, open_sg)
      graph['edges'].extend(edges)
      _handle_terminals(template, graph, 'Parameters', 'source', parameters)
      _handle_terminals(template, graph, 'Outputs', 'sink', outputs)
      graph['subgraphs'].append(_handle_pseudo_params(graph['edges']))
  
      _render(graph, out=out)
docs: Render dot output for cloudformation.template in json format.