query {
  cat
}

mutation {
  addPet(name: "Example") {
    response
  }
}

type Query {
  cat: String
}

type Mutation {
  addPet (name: String!, petType: PetType): Result!
}

enum PetType {
  CAT
  DOG
}

type Result {
  pageNumber: Int
  response: String
}