anchor.diff:  
     # A unique identifier for the client performing the mutation.
     clientMutationId: String
  +}
  +
  +input addUserRoleMutationInput {
  +  clientMutationId: String
  +  id: String!
  +  role: String!
  +}
  +
  +type addUserRoleMutationPayload {
  +  clientMutationId: String
  +
  +  # On success: the updated user roles
  +  roles: [String]!
   }
   
   # Autogenerated input type of AddUserToSubmissionMutation
  
positive.code:   clientMutationId: String
    me: Me!
    userInterest: UserInterest!
  }
  
  # Autogenerated input type of DeleteViewingRoom
  
negative.code:     # Parameters for AddAssetToConsignmentSubmission
      input: AddAssetToConsignmentSubmissionInput!
    ): AddAssetToConsignmentSubmissionPayload
  
    # Add a role to to User
    addUserRole(input: addUserRoleMutationInput!): addUserRoleMutationPayload
    addUserToSubmission(
      # Parameters for AddUserToSubmissionMutation
      input: AddUserToSubmissionMutationInput!
  