[wp-hackers] Adding rewrite rules to wp

[Gerhard Brauckmann]

Dear friends of WP, I would like to add a rule to WP.
I took the example from the WP Codex and did also some digging within 
Jeromes TAGs plugin.

I cant get it running. So I got some specific questions:

- when using the Codex example, do I have to add the query_var also into 
wp_rewrite?

see my example here:
/* add PARTS List to specific POST  */
/* example: http://mydomain/2007/09/31/xmas-tools-44/part/334  */
/* this should pass to post /2007/09/31/xmas-tools-44 */
/* whithin single.php axtract query_var (part) with token 334  - do 
somenting with the value */
/* finish */

class MI_Parts {

function MI_Parts() {
        add_action('init', array(&$this, 'mi_initRewrite'));           // 
can't use WP rewrite flags until "init" hook 
        } // end of initialization

/* function from Jeromes Keywords */
        function mi_initRewrite() {
        global $wp_rewrite;
        /* detect permalink type & construct base URL for local links */
        $base_url = get_settings('home') . '/';
        if (isset($wp_rewrite) && $wp_rewrite->using_permalinks()) {
            $rewriteon = true;                    // using rewrite rules
            $base_url .= $wp_rewrite->root;             // set to 
"index.php/" if using that style
            $base_url .= 'part/';
                } else {
                $base_url .= '?part=';
                }
 
        /* generate rewrite rules for tag queries */
        if ($rewriteon)
            add_filter('post_rewrite_rules', array(&$this, 
'mi_createRewriteRules'));
 
        /* flush rules if requested */
        $initdone = true;
        if ($flushrules) 
            $wp_rewrite->flush_rules();
    }

/* function from Jeromes Keywords */
        function mi_createRewriteRules($rewrite) {
        global $wp_rewrite;
        /* add rewrite tokens */
        $qvar ="part";
        $token = '%' . $qvar . '%';
        $wp_rewrite->add_rewrite_tag($token, '(.+)', $qvar . '=');
        $keywords_structure = $wp_rewrite->root . $qvar . "/$token";
        $keywords_rewrite = 
$wp_rewrite->generate_rewrite_rules($keywords_structure);
        return ( $rewrite + $keywords_rewrite );
    }

} // of CLASS


with this code I'm expecting someting like [..../part/ ..] in the 
wp_rewrite_rules list (array) but there ist still nothing 
What is worng here? (Im using WP 2.3)


Regards
Gerhard Brauckmann