anchor.diff:    url: URI!
   }
   
  +"""
  +Represents a 'marked_as_duplicate' event on a given issue or pull request.
  +"""
  +type MarkedAsDuplicateEvent implements Node {
  +  """Identifies the actor who performed the event."""
  +  actor: Actor
  +
  +  """Identifies the date and time when the object was created."""
  +  createdAt: DateTime!
  +  id: ID!
  +}
  +
   """A public description of a Marketplace category."""
   type MarketplaceCategory implements Node {
     """The category's description."""
  
positive.code:   ALPHABETICAL
  }
  
  """Represents an owner of a registry package."""
  interface RegistryPackageOwner {
    id: ID!
  }
  
  """Represents an interface to search packages on an object."""
  interface RegistryPackageSearch {
    id: ID!
  }
  
  """A release contains the content for a release."""
  
negative.code: """Used for return value of Repository.issueOrPullRequest."""
  union IssueOrPullRequest = Issue | PullRequest
  
  """An edge in a connection."""
  type IssueOrPullRequestEdge {
    """A cursor for use in pagination."""
    cursor: String!
  
    """The item at the end of the edge."""
    node: IssueOrPullRequest
  }
  
  """The possible PubSub channels for an issue."""
  enum IssuePubSubTopic {
    """The channel ID for observing issue updates."""
  