The link I posted is to a TTL formatted version of RDF…
You are using nquads which is fine. RDF is just a data model, nothing more. There are several encodings of that data model. I converted my turtle to nquads before doing my test using the popular rapper tool. I have not posted my nquad version though. I can if you like but it is valid nquads. Rapper is part of the mature Redland tools Raptor RDF Parser Toolkit - Raptor RDF parser utility