<unit name="ok_lowecase_keywords">
  <description><abstract>Test unit with <code>nil</code> and <code>true</code> and <code>false</code>.</abstract><detailed> Note that case of tag doesn't matter: <code>nil</code> and <code>true</code> and <code>false</code> , <code>nil</code> and <code>true</code> and <code>false</code> .</detailed></description>
</unit>
