title: svcutil and specified fields
body: <p>I am generating a datacontract with svcutil from a webservice.</p>
  
  <pre><code>svcutil /language:cs /noConfig /targetclientversion:Version35 
          /out:Generated\ProductService.cs http://example.com/ProductService.svc?wsdl
  </code></pre>
  
  <p>The fields generated looks like this:  </p>
  
  <pre><code>private System.Nullable&lt;System.DateTime&gt; createdField;
  private bool createdFieldSpecified;
  </code></pre>
  
  <p>How can the fields be both nullable and have a specified field?</p>