docs: public static Function<Quad, Quad> skolemizeQuads(final ResourceService svc, final String baseUrl) {
          return quad -> rdf.createQuad(quad.getGraphName().orElse(PreferUserManaged),
                  (BlankNodeOrIRI) svc.toInternal(svc.skolemize(quad.getSubject()), baseUrl), quad.getPredicate(),
                  svc.toInternal(svc.skolemize(quad.getObject()), baseUrl));
      }