title: Copy element from one DOMDocument to another
body: <p>Is there any way to copy (deep) element from one DOMDocument instance to another?</p>
  
  <pre><code>&lt;Document1&gt;
    &lt;items&gt;
      &lt;item&gt;1&lt;/item&gt;
      &lt;item&gt;2&lt;/item&gt;
      ...
    &lt;/items&gt;
  &lt;/Document1&gt;
  
  &lt;Document2&gt;
    &lt;items&gt;
    &lt;/items&gt;
  &lt;/Document&gt;
  </code></pre>
  
  <p>I need to copy /Document1/items/* to /Document2/items/.</p>
  
  <p>It seems that DOMDocument doesn't have methods to import nodes from another DOMDocument. It even can't create nodes from xml text.</p>
  
  <p>Of course I can achieve this using string operations, but maybe there is simpler solution?</p>