title: Using a Choice Complex Datatype with JAXB
body: <p>I have the following XML message and I need to deserialize it</p>
  
  <pre><code>&lt;xs:complexType name="DataType"&gt;
     &lt;xs:choice&gt;
         &lt;xs:element name="Ext_a_Data" type="ExtTest1DataType" /&gt;
         &lt;xs:element name="Ext_b_Data" type="ExtTest2DataType" /&gt;
         &lt;xs:element name="Ext_c_Data" type="ExtTest3DataType" /&gt;
     &lt;/xs:choice&gt;
  &lt;/xs:complexType&gt;
  </code></pre>
  
  <p>How do I handle this?</p>