@type t() :: %ExVoix.ModelContext.UIResource{
  content:
    ExVoix.ModelContext.UI.RawHtmlPayload.t()
    | ExVoix.ModelContext.UI.ExternalUrlPayload.t()
    | ExVoix.ModelContext.UI.RemoteDomPayload.t()
    | nil,
  encoding: ExVoix.ModelContext.UIResource.EncodingType.t() | nil,
  metadata: %{} | nil,
  ui_metadata: %{} | nil,
  uri: String.t() | nil
}