code: public List<String> getGVParameterNames(Document document, String gvname, String version) {
          ArrayList<String> ret = new ArrayList<>();
          Element gvdef = document.getElementById(gvname + version);
          NodeList gvcontent = gvdef.getChildNodes();
          int len = gvcontent.getLength();
  
          boolean first = true;
          for (int i = 0; i < len; i++) {
              Node contentref = gvcontent.item(i);
  
              if (contentref.getNodeType() == Node.ELEMENT_NODE) {
                  // skip seghead
                  if (first) {
                      first = false;
                  } else {
                      addLowlevelProperties(document, ret, "", (Element) contentref);
                  }
              }
          }
  
          return ret;
      }
docs: /* gibt für einen hbci-gv ("saldo3") die liste aller ll-job-parameter
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