content: sub init()
      target = createObject("roSGNode", "Node")
      target.update({ trigger: "none" }, true)
  
      a = createObject("roSGNode", "ScopedObserver")
      b = createObject("roSGNode", "ScopedObserver")
      c = createObject("roSGNode", "ScopedObserver2")
  
      a.id = "a"
      a.target = target
  
      b.id = "b"
      b.target = target
  
      c.id = "c"
      c.target = target
  
      target.trigger = "1"
      target.trigger = "2"
      target.trigger = "unobserve-a"
      target.trigger = "3"
  end sub
  