anchor.diff:      id: ID!
     ): Node
   
  +  # User's notification preferences
  +  notificationPreferences(
  +    authenticationToken: String
  +  ): [NotificationPreference!]!
  +
     # Get an Offer
     offer(
       # Return offers for the given partner
  
positive.code:   bio: String
    collectorLevel: Int
  
    # List of artists names the Collector is interested in
    collectorProfileArtists: [CollectorProfileArtists]
    confirmedBuyerAt(
      format: String
  
negative.code:     id: ID!
    ): Node
  
    # User's notification preferences
    notificationPreferences(
      authenticationToken: String
    ): [NotificationPreference!]!
  
    # An OrderedSet
    orderedSet(
      # The ID of the OrderedSet
  