ing a plug-in to the toolkit; new Ant targets may be     inserted before or after common processing, and new rules may be imported into common XSLT modules to override     default processing.</li>
<li class="link ulchildlink"><strong><a href="../dev_ref/processing-order.html">Processing order</a></strong><br>
The order of processing is often significant when evaluating DITA content. Although the DITA specification     does not mandate a specific order for processing, the DITA-OT has determined that performi