How to retrieve the rdf representation?

I'm evaluating the project to extend the frontend for a custom project. It's really nice, but can't find any end-point to retrieve the rdf representation for the resources. 

Retrieving json format is simple, like `curl -X GET  -H "Accept: application/json" http://localhost/datasets/parkeerautomaten`. I've changed to `Accept: application/rdf+xml`, but returns json format.

Thanks in advance.
