of:

 YAML 1.1 keyword representing 
  <a href="https://yaml.org/type/bool.html">boolean</a>
  
 YAML 1.1 keyword representing 
  <a href="https://yaml.org/type/null.html">null</a> value
   
 empty String (length 0)
   

 and returns <code>true</code> if so.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../com/fasterxml/jackson/dataformat/yaml/util/StringQuotingChecker.ht