docs: function writeNormalizeRml(store, writer) {
    normalizeRml(store, function () {
      let parsedBlankSubjects = {};
      writeBlanks(store, parsedBlankSubjects);
      let quads = store.getQuads();
      quads.forEach(function (quad) {
        if (parsedBlankSubjects[quad.subject]) {
          return;
        }
        if (parsedBlankSubjects[quad.object]) {
          writer.addQuad(quad.subject, quad.predicate, writer.blank(parsedBlankSubjects[quad.object]));
          return;
        }
        writer.addTriple(quad);
      });
    });
  }