D-Net

		getExecutor().submit(() -> {

			try {

				int offset = 0;

				do {

					List<String> subjectList = getSubjectList(offset);

					for (String subject : subjectList) {

	protected String tryGetRDF(final String subjectURL, int attempt) throws URISyntaxException, InterruptedException, VirtuosoParthenosException {

		if (attempt <= 0) {

			errors.merge("Failed tryGetRDF", 1, Integer::sum);

			return null;