user { # User
  n1: circle label:"Start Validator"
  n3: rectangle label:"Validate Validator conditions"
  n5: rectangle label:"Record Validator outcome"
  n7: circle label:"End Validator"
  n1.handle(bottom) -> app.n2.handle(top)
  n1.handle(right) -> n3.handle(left)
  n1.handle(bottom) -> app.n4.handle(top)
  n1.handle(bottom) -> app.n6.handle(top)
  n5.handle(right) -> n7.handle(left)
  n3.handle(top) -> n7.handle(top)
  n1.handle(right) -> n5.handle(bottom)
}

app { # App
  n2: rectangle label:"Receive Validator event"
  n4: rectangle label:"Execute Validator action"
  n6: diamond label:"Monitor Validator status"
  n6.handle(right) -> user.n7.handle(bottom)
  n4.handle(right) -> user.n7.handle(bottom)
  n2.handle(right) -> user.n7.handle(bottom)
}