       tags: [
         tag: @ReferenceField Tag, ['name', 'slug']
       ]
+      comments: [
+        author: @ReferenceField Person, ['slug', 'givenName', 'familyName', 'gravatarHash', 'user.username']
+      ]

  #     _id
  #     name: ISO 639-1 dictionary
  #     slug: ISO 639-1 dictionary
  # local (client only): is this annotation just a temporary annotation on the client side

  @Meta

  #   gravatarHash
  #   user
  #     username
  # body: in HTML
  # publication:
  #   _id
  # references: made in the body of annotation or comments
  #   highlights: list of
  #     _id
  #   annotations: list of
