code: private Tuple<Element, Element> symbol(final Path file, final String id) throws IOException {
      Element svg = Jsoup.parse(file.toFile(), "UTF-8").select("svg").first();
      Element symbol = new Element(Tag.valueOf("symbol"), "")
          .attr("id", id)
          .attr("viewBox", svg.attr("viewBox"));
      new ArrayList<>(svg.childNodes()).forEach(symbol::appendChild);
      return new Tuple(svg, symbol);
    }
docs: Read a svg file and return the svg element (original) and a new symbol element (created from
  original).
  
  @param file Svg file.
  @param id   ID to use.
  @return Svg element (original) and a symbol element (converted).
  @throws IOException If something goes wrong.