title: XML Canonicalization returns empty elements in the transformed output
body: <p>I have a <a href="https://stackoverflow.com/questions/6910253/using-xpath-with-default-namespace-in-c-for-canonicalisation">related post</a> asking how to select nodes from an XmlDocument using an XPath statement.</p>
  
  <p>The only way I could get the SelectNodes to work was to create a non default namespace "x" and then explicitly reference the nodes in the XPath statement.</p>
  
  <p>Whilst this works and provides me with a node list, the canonicalization then fails to produce any content to my selected nodes in the output.</p>
  
  <p>I've tried using XmlDsigExcC14NTransform and specifying the namespace but this produces the same output.</p>
  
  <p>Below is an example of the xml output produced (using the XML in my <a href="https://stackoverflow.com/questions/6910253/using-xpath-with-default-namespace-in-c-for-canonicalisation">related post</a>):</p>
  
  <pre><code>&lt;Applications xmlns="http://www.myApps.co.uk/"&gt;
    &lt;Application&gt;
      &lt;ApplicantDetails&gt;
        &lt;Title&gt;
        &lt;/Title&gt;
        &lt;Forename&gt;
        &lt;/Forename&gt;
        &lt;Middlenames&gt;
          &lt;Middlename&gt;
          &lt;/Middlename&gt;
        &lt;/Middlenames&gt;
        &lt;PresentSurname&gt;
        &lt;/PresentSurname&gt;
        &lt;CurrentAddress&gt;
          &lt;Address&gt;
            &lt;AddressLine1&gt;
            &lt;/AddressLine1&gt;
            &lt;AddressLine2&gt;
            &lt;/AddressLine2&gt;
            &lt;AddressTown&gt;
            &lt;/AddressTown&gt;
            &lt;AddressCounty&gt;
            &lt;/AddressCounty&gt;
            &lt;Postcode&gt;
            &lt;/Postcode&gt;
            &lt;CountryCode&gt;
            &lt;/CountryCode&gt;
          &lt;/Address&gt;
          &lt;ResidentFromGyearMonth&gt;
          &lt;/ResidentFromGyearMonth&gt;
        &lt;/CurrentAddress&gt;
      &lt;/ApplicantDetails&gt;
    &lt;/Application&gt;
    &lt;Application&gt;
      &lt;ApplicantDetails&gt;
        &lt;Title&gt;
        &lt;/Title&gt;
        &lt;Forename&gt;
        &lt;/Forename&gt;
        &lt;Middlenames&gt;
          &lt;Middlename&gt;
          &lt;/Middlename&gt;
        &lt;/Middlenames&gt;
        &lt;PresentSurname&gt;
        &lt;/PresentSurname&gt;
        &lt;CurrentAddress&gt;
          &lt;Address&gt;
            &lt;AddressLine1&gt;
            &lt;/AddressLine1&gt;
            &lt;AddressLine2&gt;
            &lt;/AddressLine2&gt;
            &lt;AddressTown&gt;
            &lt;/AddressTown&gt;
            &lt;AddressCounty&gt;
            &lt;/AddressCounty&gt;
            &lt;Postcode&gt;
            &lt;/Postcode&gt;
            &lt;CountryCode&gt;
            &lt;/CountryCode&gt;
          &lt;/Address&gt;
          &lt;ResidentFromGyearMonth&gt;
          &lt;/ResidentFromGyearMonth&gt;
        &lt;/CurrentAddress&gt;
      &lt;/ApplicantDetails&gt;
    &lt;/Application&gt;
  &lt;/Applications&gt;
  </code></pre>