This is really just an AP example. On the one hand it shows how very basic AP support can be done with static files (see APStatic for how to set something similar up). On the other hand it's an example of an object using an extended type. Intsead of "type": "Recipe" it uses "type": ["Article", "Recipe"]. Note that the Recipe type was made for this example and isn't something official anywhere at the moment of writing.