ng filtering before conref     resolution best meets user expectations. Switching the order of processing, while legal, may give different results. </li>
<li class="link ulchildlink"><strong><a href="../dev_ref/DITA-OTPreprocess.html">Pre-processing modules</a></strong><br>
The pre-processing operation is a set of steps that typically runs at the beginning of every DITA-OT     transformation. Each step or stage corresponds to an Ant target in the build pipeline; the preprocess target calls     the entire se