schema.gql

type Query {
  deity(name: String): Deity!
}

interface Character {
  name: String
}

interface Supernatural {
  power: [String!]!
}

type Hero implements Character {
  field: String
}

type Deity implements Character & Supernatural {
  name: Int
  power: [String!]
}

# TODO: validate arguments
# interface Aged {
#   age(num: Int): String!
# }

# type Human implements Aged {
#   age(num: Int!): String
# }

# type God implements Aged {
#   age(date: String!): String
# }