type Bird @shareable @fieldMarks(plumage: "juvenile") {
    id: ID!
    name: String!
    species: String!
    observedAt: DateTime! @deprecated
    location: String! @tag(name: "locationService") @tag(name: "a")
    notes: String @deprecated(reason: "Field is obsolete due to new data model.")
}

type BirdObservation @id(fields: "observationID") {
    observationID: ID!
    bird: Bird!
    observerDetails: ObserverDetails!
    timeOfObservation: DateTime!
}

type ObserverDetails @notComposed {
    name: String!
    membershipNumber: String
    observerType: ObserverType!
}

enum ObserverType {
    AMATEUR
    SEMIPROFESSIONAL @deprecated(reason: "No such thing as semiprofessionals")
    PROFESSIONAL
}

input BirdObservationFilters {
    observerName: String
    observerType: ObserverType
    observedAt: DateTime @deprecated(reason: "UNIX timestamps instead, as usual in bird watching")
    first: Int
}

type Query {
    birdObservations(filters: BirdObservationFilters): [BirdObservation]
    birdObservation(observationID: ID!): BirdObservation
}

schema @composeDirective(name: "@fieldMarks")  {
    query: Query
}