program Toggles {
  property Health { current: int = 0, maximum: int = 100 }
  property Shield { amount: int = 0 }
  model Player { Health, Shield }

  # hooks fire at the toggle point, data bound by name
  @OnDisable(Shield) handler ShieldDown { print(Shield.amount + 1) }
  @OnEnable(Shield)  handler ShieldUp   { print(Shield.amount + 2) }

  handler SpawnPlayer phase Start {
    spawn Player { Health { maximum: 50 }, Shield { amount: 5 } }
  }

  handler ToggleShield phase Render {
    for (player) in query [Player] { disable Shield on self() }   # @OnDisable
    for (player) in query [Player] { enable  Shield on self() }   # @OnEnable, data intact
    disable Player                                                # whole model off
    quit()
  }
}