code: final public void addParentFromToken(MtasToken token) throws IOException {
      if (!closed && (token != null)) {
        if (token.checkParentId()) {
          addSinglePoint(token.getParentId(), token.getPrefixId(),
              token.getTermRef(), token.getId(), token.getTokenRef());
        }
      }
    }
docs: Adds the parent from token.
  
  @param token the token
  @throws IOException Signals that an I/O exception has occurred.