Actually if you look at https://github.com/symfony-cmf/createphp/blob/d146e4d71dd0797ffc0c4ccc859c4cf9a8e2ab1a/README.md#twig-extension, the first example is using the autotag:
``{% createphp mymodel %}{{ mymodel_rdf|raw }}{% endcreatephp %}``
Is it ok like this?