title: Xidel keeps adding XMLNS in the output
body: <p>I am trying to extract html code from a div:</p>
  
  <pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;
  
  &lt;body&gt;
  &lt;div id="tbParams"&gt;
      &lt;table class="ParametrList" style="border-collapse: collapse; width: 100%;"&gt;
          &lt;tr class="Parametr altrow"&gt;
              &lt;td class="Nazev"&gt;
              Hello                &lt;/td&gt;
              &lt;td class="Hodnota" style="vertical-align: top;"&gt;
  
              &lt;/td&gt;
          &lt;/tr&gt;
  &lt;/table&gt;
  &lt;/div&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>...with xidel:</p>
  
  <pre><code>xidel input.html -e '//div[@id="tbParams"]' --output-format html
  </code></pre>
  
  <p>For some reason it keeps adding XMLNS attributes to the output:</p>
  
  <pre><code>&lt;div xmlns="http://www.w3.org/1999/xhtml" id="tbParams"&gt;
      &lt;table class="ParametrList" style="border-collapse: collapse; width: 100%;"&gt;
          &lt;tbody xmlns=""&gt;&lt;tr xmlns="http://www.w3.org/1999/xhtml" class="Parametr altrow"&gt;
              &lt;td class="Nazev"&gt;
              Hello                &lt;/td&gt;
              &lt;td class="Hodnota" style="vertical-align: top;"&gt;
  
              &lt;/td&gt;
          &lt;/tr&gt;
  &lt;/tbody&gt;&lt;/table&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>If I remove <code>xmlns="http://www.w3.org/1999/xhtml"</code> from the <code>&lt;html&gt;</code> tag, then it is OK.</p>