>boolean indicating whether the attribute is 
          a version attribute</dd>
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<h4>isOptional</h4>
<pre class="methodSignature">boolean&nbsp;isOptional()</pre>
<div class="block">Can the attribute be null.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>boolean indicating whether the attribute can
          be null</dd>
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