title: Construct lxml.etree from json disable excaping
body: <p>I have a python script which takes a json and generates an xml with the values that I need. Unfortunately one of the values has CDATA tag which is escaped somehow by lxml.etree. How do I disable it?</p>
  
  <pre><code>import lxml.etree as ET
  
  print ("Desired:")
  print (ET.tostring(string_res, encoding='utf-8', method='xml'))
  string_res.text = ''
  string_res.text = value['Value']
  
  print ("Desired:")
  print string_res.text
  
  print ("Not desired:")
  print (ET.tostring(string_res, encoding='utf-8', method='xml'))
  </code></pre>
  
  <p>result is</p>
  
  <pre><code>Desired:
  &lt;![CDATA[&lt;b&gt;hello&lt;/b&gt;]]&gt;
  
  Desired:
  &lt;![CDATA[&lt;b&gt;hello&lt;/b&gt;]]&gt;
  
  Not desired:
  &amp;lt;![CDATA[&amp;lt;b&amp;gt;hello&amp;lt;/b&amp;gt;]]&amp;gt; 
  </code></pre>