docs: private void handleID(final AttributesImpl atts) {
          String idValue = atts.getValue(ATTRIBUTE_NAME_ID);
          if (idValue != null) {
              XMLUtils.addOrSetAttribute(atts, ATTRIBUTE_NAME_OID, idValue);
              final URI value = setFragment(dirPath.toURI().resolve(toURI(filePath)), idValue);
              if (util.findId(value)) {
                  idValue = util.getIdValue(value);
              } else {
                  idValue = util.addId(value);
              }
              XMLUtils.addOrSetAttribute(atts, ATTRIBUTE_NAME_ID, idValue);
          }
      }