function handle($match, $state, $pos, &$handler) {
        // echo "handle: state=$state<br>";
        // echo "handle: match=$match<br>";
        // echo "handle: pos=$pos<br>";
        
        ...
        
    function render($mode, &$renderer, $data) {
        if ($mode == 'xhtml') {
            $img = DOKU_BASE . 'lib/plugins/plantuml/img.php?' . buildURLParams($data);