template "widget[@type='ForEach']", mode="widget_defs" {
    param "hmi_element";
    const "widgets", "func:refered_elements($forEach_widgets)[not(@id = $forEach_widgets_ids)]";
    |     frequency: 2,
    |     dispatch: function(value) {
    |                     // do something
    |     },
    |     index_pool: [
    |     ],
    |     buttons: [
    const "class","arg[1]/@value";
    const "prefix","concat($class,':')";
    const "buttons_regex","concat('^',$prefix,'[+\-][0-9]+')";
    foreach "$hmi_element/*[regexp:test(@inkscape:label, $buttons_regex)]" {
    |         ["«substring-after(@inkscape:label, concat(arg[1]/@value, ':'))»", id("«@id»")]`if "position()!=last()" > ,`
    }
    |     ],
    |     init: function() {
    |         /* TODO elt.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_click(evt)");*/
    |     },

    |     items: [
    const "base_path","path/@value";
    const "items_regex","concat('^',$prefix,'[0-9]+')";
    const "unordered_items","$hmi_element//*[regexp:test(@inkscape:label, $items_regex)]";
    foreach "$unordered_items" {
        const "elt_label","concat($prefix, string(position()))"; 
        const "elt","$unordered_items[@inkscape:label = $elt_label]";
        
    |   /* `apply "func:get_hmi_tree_elt($base_path)", mode="testtree";` */
    |       [ /* «$elt_label» */
        if "count($elt)=0" error > Missing item labeled «$elt_label» in ForEach widget «$hmi_element/@id»
        foreach "func:refered_elements($elt)[@id = $hmi_elements/@id][not(@id = $elt/@id)]" {
    |         hmi_widgets["«@id»"]`if "position()!=last()" > ,`
        }
    |       ]`if "position()!=last()" > ,`
    }
    |     ],
}

template "widget[@type='ForEach']", mode="widget_subscribe"{
    // param "hmi_element";
    |     sub: function(off){
    |         subscribe.call(this,off);
        /* TODO */
    |     },

    |     unsub: function(){
    |         unsubscribe.call(this);
        /* TODO */
    |     },
}