If a map entry that has not yet been reached is removed during iteration,
the corresponding iteration value will not be produced. If a map entry is
created during iteration, that entry may be produced during the iteration or
may be skipped. The choice may vary for each entry created and from one
iteration to the next.
If the map is <code>nil</code>, the number of iterations is 0.
</li>

<li>

    <magic priority="50">
      <!-- SZDD... -->
      <match value="0x535A444488F0273341" offset="0"/>
    </magic>
  </mime-type>
  <mime-type type="application/x-ms-owner">
    <_comment>Temporary files created by MSOffice applications</_comment>
    <_comment>PRONOM fmt-473</_comment>
    <_comment>First byte and 53rd byte are the same -- the length of the name.</_comment>