app.yml
 
all:
  menu_maker_yui_mymenu1:
    menu_1:
      a:
        label:  'my label 1'
      items:  [sub_menu_1, sub_menu_2]
#~      allow:  [role1, role2] #permissions
    sub_menu_1:
      a:
        label:  'my label 2'
        href:   'mymodule/myaction'
#~      allow:  [role1]
    sub_menu_2:
      a:
        label:  'my label 3'
      items:  [sub_sub_menu_1]
#~      allow:  [role1]
    sub_sub_menu_1:
      a:
        label:  'my label 4'
        href:   'mymodule/myotheraction'
#~      allow:  [role1]
 
 
Cached app.yml file:
<?php
// auto-generated by sfDefineEnvironmentConfigHandler
// date: 2008/11/20 18:45:42
sfConfig::add(array(
  'app_menu_maker_yui_mymenu1_menu_1' => array (
  'a' => 
  array (
    'label' => 'my label 1',
  ),
  'items' => 
  array (
    0 => 'sub_menu_1',
    1 => 'sub_menu_2',
  ),
),
  'app_menu_maker_yui_mymenu1_sub_menu_1' => array (
  'a' => 
  array (
    'label' => 'my label 2',
    'href' => 'mymodule/myaction',
  ),
),
  'app_menu_maker_yui_mymenu1_sub_menu_2' => array (
  'a' => 
  array (
    'label' => 'my label 3',
  ),
  'items' => 
  array (
    0 => 'sub_sub_menu_1',
  ),
),
  'app_menu_maker_yui_mymenu1_sub_sub_menu_1' => array (
  'a' => 
  array (
    'label' => 'my label 4',
    'href' => 'mymodule/myotheraction',
  ),
),
));
 
 
 
 
$app_config_store_array = sfConfig::get('app_' . 'menu_maker_yui_'. $menu_name);
 
after substitution:
 
$app_config_store_array = sfConfig::get('app_menu_maker_yui_mymenu1_menu_1');