Trying to write a Library for the new Xajax

Hello All,

I'm trying to write a library for the newly resurrected Xajax project (from Thierry Feuzeu)...

and I'm coming up short due to my inexperience in writing CodeIgniter Libraries and with PHP namespacing.

Could anyone offer some thoughts on how to make this work? (see's Thierry's example code: https://github.com/lagdo/xajax-examples/.../hello.php)

Here's what I've got so far, and it definitely instantiates an xajax object, of which I can access at least the getVersion() method from inside a CodeIgniter controller method, but I can't figure out how to write the Library to access other basics (see errors in __construct() ):
( output: http://triv.ath.cx/ci3/ )

So, I'm at a loss as to what to do next... any advice?

CodeIgniter 3 Library:

PHP Code:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

require (APPPATH . '../vendor/autoload.php');

use Xajax\Xajax;
use Xajax\Response\Response;
use Xajax\Request\Factory as xr;

class CI_Xajax {

  public $xajax = '';

    public function __construct()
    {

    $this->xajax = Xajax::getInstance();
//        $this->_ci   =& get_instance();
        
    $this->xajax->setOption('core.debug.on', true);
    $this->xajax->setOption('core.prefix.function', 'xajax_');
        
    }
} 


CodeIgniter 3 Welcome Controller:

PHP Code:

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Welcome extends CI_Controller {

    public function __construct()
    {
        parent::__construct();

        $this->load->library(array('CI_Xajax', 'session'));

//    $this->ci_xajax->xajax->register(Xajax::USER_FUNCTION, 'hello');
//    Fatal error: Class 'Xajax' not found in /var/www/html/ci3/application/controllers/Welcome.php on line 12

//    $this->ci_xajax->xajax->register(CI_Xajax::USER_FUNCTION, 'hello');
//    Fatal error: Undefined class constant 'USER_FUNCTION' in /var/www/html/ci3/application/controllers/Welcome.php on line 15

    }

    public function index()
    {
    $viewData = '';
    $viewData['XjxVersion'] = $this->ci_xajax->xajax->getVersion();

        $this->load->view('welcome_message',$viewData);
        
    }
    
    public function hello() {
        $this->load->view('welcome_message',$viewData);
    }
} 


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(Using CodeIgniter since 1.x)