- &foo
  given-name:    foo
  family-name:   Foo
  post:          exective
- &bar
  given-name:    bar
  family-name:   Bar
  post:          manager
  supervisor:    *foo
- given-name:    baz
  family-name:   Baz
  post:          clerk
  supervisor:    *bar
- given-name:    zak
  family-name:   Zak
  post:          clerk
  supervisor:    *bar
