private static ContentType TranslateContentTypeToEnum(String contentType){
		switch(contentType){
		case "application/rdf+xml":
			return ContentType.RDF;
		case "application/x-turtle":
			return ContentType.TURTLE;
		case "text/turtle":
			return ContentType.TURTLE;
		case "text/plain":
			return ContentType.NT;
		case "text/rdf+n3":
			return ContentType.N3;
		default:
			return null;
		}
	}