Sample navigation.yml

MenuItem(main):
  name: Main Menu
 
MenuItem(home):
  text: Home
  action: Application.index
  parent: main
  properties:
    extraClass: homeLink
  
MenuItem(articles):
  parent: main
  text: Articles
  action: Articles.index

MenuItem(popular):
parent: articles
text: Popular
action: Articles.popular

MenuItem(archive):
parent: archive
text: Archive
action: Articles.archive

MenuItem(admin):
parent: main
text: Admin Area
action: Admin.index
labels:
- admin