code: @Override
      protected String doRender(final RenderConfiguration config, final Subgraph subgraph) {
  
          final String prologue = config.getIndent() + "subgraph "
                  + quote(subgraph.getId())
                  + " { "
                  + config.getNewline();
  
          // Render the statements within this subgraph.
          final Statements statements = subgraph.getStatements();
          final StatementsRenderer statementsRenderer = new StatementsRenderer();
          final String renderedStatements = statementsRenderer.render(config.cloneAndChangeIndentation(1), statements);
  
          // All Done.
          return prologue + renderedStatements + config.getNewline() + config.getIndent() + "}";
      }
docs: {@inheritDoc}