query.graphql

query {
   getMeeting(meetingId:"meeting001"){
    id
    organizer{
      identifier
      firstname
      lastname
      email
      salary(currency:Euro)
    }
    room{
      capacity
    }
    invitations {
      accepted
      person{
        firstname
        lastname
        email
        ... on Employee {
          identifier
          salary
        }
        ... on ExternalWorker {
          company
        }
      }
    }
  }
}