directive @core(feature: String!) repeatable on SCHEMA

directive @join__owner(graph: join__Graph!) on OBJECT

directive @join__type(
    graph: join__Graph!
    key: String!
    resolvable: Boolean = true
) repeatable on OBJECT | INTERFACE

directive @join__field(
    graph: join__Graph
    requires: String
    provides: String
) on FIELD_DEFINITION

directive @join__graph(name: String!, url: String!) on ENUM_VALUE

enum join__Graph {
    PIZZA @join__graph(name: "pizza", url: "http://example.com/pizza")
    SUSHI @join__graph(name: "sushi", url: "http://example.com/sushi")
}

type Pizza {
    id: ID! @join__field(graph: PIZZA)
    nameEn: String @join__field(graph: PIZZA)
    nameIt: String! @join__field(graph: PIZZA)
    toppings: [Topping!]! @join__field(graph: PIZZA)
}

type Onion {
    variety: String @join__field(graph: PIZZA)
}

type Cheese {
    quantity: Int! @join__field(graph: PIZZA)
    type: String! @join__field(graph: PIZZA)
}

type Pineapple {
    isAnanas: Boolean! @join__field(graph: PIZZA)
}

type Sushi {
    id: ID! @join__field(graph: SUSHI)
    topping: Topping @join__field(graph: SUSHI)
}

type Salmon {
    id: ID! @join__field(graph: SUSHI)
    raw: Boolean @join__field(graph: SUSHI)
}

type Omelet {
    isRectangular: Boolean @join__field(graph: SUSHI)
}

type Query {
    pizza(id: ID!): Pizza @join__field(graph: PIZZA)
}

union Topping = Onion | Cheese | Pineapple | Salmon | Omelet