s to the
          same AreaTreeModel instance which essentially concatenates all the input document to one single
          output document.
        </p>
<a name="N10064"></a><a name="modifying"></a>
<h3 class="underlined_5">Modifying Documents</h3>
<p>
          One of the most important use cases for the intermediate format is obviously modifying the area
          tree XML before finally rendering it to the target format. You can easily use XSLT to process
          the IF file according to your needs. 