 implementers are included in the IR when
    provided to document the utility and implementability of the
    specification.
  </li>
-->
      <li>
        The IR must cover all specified features in the specification. For each feature the IR should indicate:
        <ul>
          <li>Feature status: required, optional, other.</li>
          <li>Feature utility/usefulness based on feedback from implementers.</li>
          <li>Implementability of the feature specification.</li>
        </ul>
      </li>
 