type Query {
  human: Human
}

interface Sentient {
  name: String!
}

interface Pet {
  name: String!
}

type Dog implements Pet {
  name: String!
  barkVolume: Int
}

type Cat implements Pet {
  name: String!
  meowVolume: Int
}

union CatOrDog = Cat | Dog

type Human implements Sentient {
  name: String!
  pets: [Pet!]
}

type Alien implements Sentient {
  name: String!
  homePlanet: String!
}

union HumanOrAlien = Human | Alien

query getHuman {
  human {
    ...catInDogFragmentInvalid
    ...sentientFragment
    ...humanOrAlienFragment
    ...nonIntersectingInterfaces
    ...sentientFragment2
  }
}

fragment catInDogFragmentInvalid on Dog {
  ... on Cat {
    meowVolume
  }
}

fragment sentientFragment on Sentient {
  ... on Dog {
    barkVolume
  }
}

fragment humanOrAlienFragment on HumanOrAlien {
  ... on Cat {
    meowVolume
  }
}

fragment nonIntersectingInterfaces on Pet {
  ...sentientFragment2
}

fragment sentientFragment2 on Sentient {
  name
}