t() :: %Fiet.Atom.Entry{
  authors: [Fiet.Atom.Person.t()],
  categories: [Fiet.Atom.Category.t()],
  content: {:text | :html, title :: binary()} | nil,
  contributors: [Fiet.Atom.Person.t()],
  id: binary() | nil,
  links: [Fiet.Atom.Link.t()],
  published: binary() | nil,
  rights: {:text | :html, title :: binary()} | nil,
  summary: {:text | :html, title :: binary()} | nil,
  title: {:text | :html, title :: binary()} | nil,
  updated: term()
}