title: What XML do I send for a field thats declared as nillable?
body: <p>I have an application with a REST style interface that takes XML documents via POST from clients. This application is written in Java and uses XML beans to process the posted message. </p>
  
  <p>The XML schema definition for a field in the message looks like this:</p>
  
  <pre><code>&lt;xs:element name="value" type="xs:string" nillable="true" /&gt;
  </code></pre>
  
  <p>How do I send a null value that meets this spec?</p>
  
  <p>I sent <code>&lt;value xsi:nil="true" /&gt;</code>
  but this caused the XML parser to barf.</p>