docs: public void convert(org.jsoup.nodes.Document in, Document out) {
          if (!StringUtil.isBlank(in.location()))
              out.setDocumentURI(in.location());
  
          org.jsoup.nodes.Element rootEl = in.child(0); // skip the #root node
          NodeTraversor.traverse(new W3CBuilder(out), rootEl);
      }