public function nodeToDslText(NodeInterface $node)
    {
        switch ($node->getNodeType()) {
            case Node::TYPE_USE_CASE:
                return $this->useCaseNodeToDslText($node);
                break;
            default:
                throw new \InvalidArgumentException('Unknown node type "' . $node->getNodeType() . '"');
                break;
        }
    }